Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Summary Collateral Information
	Description
Group 1
Pool 8122	HYBRID ARM
Group 2
Pool 8123	HYBRID ARM
Group 3
Pool 8124	HYBRID ARM
Group 4
Pool 8125	HYBRID ARM

General Information
Description	Total	Pool 8122	Pool 8123	Pool 8124	Pool 8125
Weighted Average Pass Through Rate	5.88915%	5.64429%	5.88885%	5.91698%	5.87655%
Weighted Average Mortgage Interest Rate	6.30403%	6.01929%	6.46385%	6.29198%	6.12655%
Weighted Average Remaining Term (in Months)	355.58708	355.09413	355.48450	355.68739	355.63581
Weighted Average Loan Age (in Months)	4.41292	4.90587	4.51550	4.31261	4.36419
Average Ending Scheduled Principal Balance	$798,265.20	$778,914.60	$733,027.97	$841,300.00	$835,476.31
Remaining Loan Count	3454	125	1262	1345	722
Ending Scheduled Principal Balance	$2,757,208,015.69	$97,364,325.21	$925,081,299.52	$1,131,548,495.03	$603,213,895.93

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Geographic Distribution
Total			Pool 8122			Pool 8123
State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance
CA	$1,957,047,407.66	70.98%	CA	$69,869,600.20	71.76%	CA	$653,826,181.76	70.68%
NY	$135,535,691.10	4.92%	IL	$11,657,407.01	11.97%	IL	$42,531,849.08	4.60%
WA	$108,048,668.62	3.92%	WA	$2,464,193.86	2.53%	NY	$41,994,626.19	4.54%
FL	$101,260,454.88	3.67%	UT	$1,852,127.61	1.90%	NJ	$24,500,265.75	2.65%
IL	$69,946,280.98	2.54%	MA	$1,714,525.26	1.76%	FL	$21,685,959.40	2.34%
OTHER	$385,369,512.45	13.98%	OTHER	$9,806,471.27	10.07%	OTHER	$140,542,417.34	15.19%

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Geographic Distribution
Pool 8124			Pool 8125
State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance
CA	$796,039,971.94	70.35%	CA	$437,311,653.76	72.50%
WA	$65,706,240.64	5.81%	NY	$43,744,947.13	7.25%
FL	$63,988,057.76	5.65%	WA	$19,320,196.73	3.20%
NY	$48,669,189.79	4.30%	CT	$15,780,277.44	2.62%
AZ	$19,476,704.89	1.72%	FL	$14,864,147.53	2.46%
OTHER	$137,668,330.01	12.17%	OTHER	$72,192,673.34	11.97%

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Prepayment Information (all groups)
	1 Month	3 Month	6 Month	12 Month	Cumulative
PSA	701.51509%	982.79622%	1241.91114%	1241.91114%	1241.91162%
CPR	6.19146%	6.71183%	7.24045%	7.24045%	7.24045%
SMM	0.53120%	0.57730%	0.62437%	0.62437%	0.62437%

Trigger Events
	Trigger Flag
Groups I and II Optional Termination Date Has Occurred; 1=Yes, 0=No	0
Group III Optional Termination Date Has Occurred; 1=Yes, 0=No	0
Group IV Optional Termination Date Has Occurred; 1=Yes, 0=No	0
Groups I and II Senior Prepayment Step-Down Has Occurred; 1=Yes, 0=No	0
Group III Senior Prepayment Step-Down Has Occurred; 1=Yes, 0=No	0
Group IV Senior Prepayment Step-Down Has Occurred; 1=Yes, 0=No	0
Groups I and II Senior Credit Support Depletion Date Has Occurred; 1=Yes, 0=No	0
Group III Senior Credit Support Depletion Date Has Occurred; 1=Yes, 0=No	0
Group IV Senior Credit Support Depletion Date Has Occurred; 1=Yes, 0=No	0

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Comments

1. The Class L-B Subordinate Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, to the Group 1 and Group 2 Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated June 21, 2007 to that certain Prospectus, dated April 17, 2007, pursuant to which the certain Senior Certificates were offered.

2. The Group 3-B Subordinate Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, to certain Group 3 Senior Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated June 21, 2007 to that certain Prospectus, dated April 17, 2007, pursuant to which the Group 3 Senior Certificates were offered.

3. The Group 4-B Subordinate Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, to certain Group 4 Senior Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated June 21, 2007 to that certain Prospectus, dated April 17, 2007, pursuant to which the Group 3 Senior Certificates were offered.

4. The MBA method of delinquency calculation is used.

Certificate Payment Summary Report
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
1A1	93364FAA9	$90,935,000.00	$86,856,250.67	$408,534.52	$119,213.26	$0.00	$0.00	$527,747.78	$86,737,037.41
1A2	93364FAB7	$5,293,000.00	$5,055,590.65	$23,779.33	$6,938.98	$0.00	$0.00	$30,718.31	$5,048,651.67
2A1	93364FAC5	$655,523,000.00	$635,351,517.81	$3,117,909.29	$3,666,290.95	$0.00	$0.00	$6,784,200.24	$631,685,226.86
2A2	93364FAD3	$150,000,000.00	$143,845,682.86	$705,904.97	$1,118,584.99	$0.00	$0.00	$1,824,489.96	$142,727,097.87
2A3	93364FAE1	$50,000,000.00	$50,000,000.00	$245,368.84	$0.00	$0.00	$0.00	$245,368.84	$50,000,000.00
2A4	93364FAF8	$49,793,000.00	$48,260,790.44	$236,833.88	$278,488.51	$0.00	$0.00	$515,322.39	$47,982,301.93
3A1	93364FAG6	$793,429,000.00	$780,044,975.65	$3,846,256.44	$6,619,904.88	$0.00	$0.00	$10,466,161.32	$773,425,070.77

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Summary Report (Continued)
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
3A2	93364FAH4	$250,000,000.00	$245,782,853.80	$1,211,909.46	$2,085,852.95	$0.00	$0.00	$3,297,762.41	$243,697,000.85
3A3	93364FAJ0	$19,649,000.00	$19,317,549.17	$95,251.24	$163,939.70	$0.00	$0.00	$259,190.94	$19,153,609.47
3A4	93364FAK7	$47,187,000.00	$46,391,022.10	$228,745.49	$393,700.57	$0.00	$0.00	$622,446.06	$45,997,321.53
4A1	93364FAL5	$310,547,000.00	$307,993,710.88	$1,508,282.53	$229,319.68	$0.00	$0.00	$1,737,602.21	$307,764,391.20
4A2	93364FAM3	$263,000,000.00	$260,837,637.97	$1,277,353.52	$194,209.18	$0.00	$0.00	$1,471,562.70	$260,643,428.79
4A3	93364FAN1	$12,100,000.00	$12,000,514.90	$58,767.98	$8,935.10	$0.00	$0.00	$67,703.08	$11,991,579.80
LB1	93364FAP6	$25,437,000.00	$25,428,211.58	$124,289.16	$2,981.58	$0.00	$0.00	$127,270.74	$25,425,230.00
LB2	93364FAQ4	$10,598,000.00	$10,594,338.41	$51,783.49	$1,242.24	$0.00	$0.00	$53,025.73	$10,593,096.17
LB3	93364FAR2	$7,419,000.00	$7,416,436.75	$36,250.40	$869.61	$0.00	$0.00	$37,120.01	$7,415,567.14
LB4	93364FAZ4	$6,359,000.00	$6,356,802.98	$31,071.07	$745.36	$0.00	$0.00	$31,816.43	$6,356,057.62
LB5	93364FBA8	$4,769,000.00	$4,767,352.32	$23,302.08	$558.99	$0.00	$0.00	$23,861.07	$4,766,793.33
LB6	93364FBB6	$3,710,281.54	$3,708,999.62	$18,129.02	$434.90	$0.00	$0.00	$18,563.92	$3,708,564.72
3B1	93364FAS0	$23,191,000.00	$23,189,136.47	$114,341.31	$629.90	$0.00	$0.00	$114,971.21	$23,188,506.57

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Summary Report (Continued)
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
3B2	93364FAT8	$9,856,000.00	$9,855,208.02	$48,594.20	$267.70	$0.00	$0.00	$48,861.90	$9,854,940.32
3B3	93364FAU5	$4,638,000.00	$4,637,627.31	$22,867.28	$125.97	$0.00	$0.00	$22,993.25	$4,637,501.34
3B4	93364FBC4	$5,218,000.00	$5,217,580.70	$25,726.92	$141.73	$0.00	$0.00	$25,868.65	$5,217,438.97
3B5	93364FBD2	$4,058,000.00	$4,057,673.92	$20,007.64	$110.22	$0.00	$0.00	$20,117.86	$4,057,563.70
3B6	93364FBE0	$2,319,790.94	$2,319,604.52	$11,437.54	$62.95	$0.06	$0.00	$11,500.49	$2,319,541.51
4B1	93364FAV3	$10,648,000.00	$10,646,970.23	$52,139.51	$338.64	$0.00	$0.00	$52,478.15	$10,646,631.59
4B2	93364FAW1	$4,259,000.00	$4,258,588.12	$20,854.82	$135.45	$0.00	$0.00	$20,990.27	$4,258,452.67
4B3	93364FAX9	$2,434,000.00	$2,433,764.61	$11,918.44	$77.41	$0.00	$0.00	$11,995.85	$2,433,687.20
4B4	93364FBF7	$2,434,000.00	$2,433,764.61	$11,918.44	$77.41	$0.00	$0.00	$11,995.85	$2,433,687.20
4B5	93364FBG5	$1,825,000.00	$1,824,823.50	$8,936.38	$58.04	$0.00	$0.00	$8,994.42	$1,824,765.46
4B6	93364FBH3	$1,217,428.45	$1,217,310.70	$5,961.32	$38.72	$0.00	$0.00	$6,000.04	$1,217,271.98
R	93364FAY7	$100.00	$0.00	$0.54	$0.00	$0.00	$0.00	$0.54	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Summary Report (Continued)
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
TFEE	XXXXXXXXX	$0.00	$0.00	$577.52	$0.00	$0.00	$0.00	$577.52	$0.00
Total*		$2,827,846,600.93	$2,772,102,291.27	$13,604,427.03	$14,894,275.57	$0.06	$0.00	$28,498,702.62	$2,757,208,015.64

*Total balances exclude notional balances.

Total Funds Available for Distribution
PRINCIPAL BALANCE
Scheduled Principal Received or Advanced	$169,681.70
Unscheduled Principal	$1,930,520.10
Prepayments in Full	$12,794,073.82
Repurchases	$0.00
Liquidations	$0.00
Total Principal	$14,894,275.62
INTEREST
Accrued Interest at Gross Rate	$14,562,855.19

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Total Funds Available for Distribution
INTEREST
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Servicing Fees	$958,427.61
Other	$0.00
Total Interest	$13,604,426.95
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00
Total Additional Funds	$0.00
Total Funds Available for Distribution	$28,498,702.57

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Report - Principal
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
1A1	93364FAA9	$86,856,250.67	$119,213.26	$0.00	$0.00	$0.00	$0.00	$119,213.26	$86,737,037.41
1A2	93364FAB7	$5,055,590.65	$6,938.98	$0.00	$0.00	$0.00	$0.00	$6,938.98	$5,048,651.67
2A1	93364FAC5	$635,351,517.81	$3,666,290.95	$0.00	$0.00	$0.00	$0.00	$3,666,290.95	$631,685,226.86
2A2	93364FAD3	$143,845,682.86	$1,118,584.99	$0.00	$0.00	$0.00	$0.00	$1,118,584.99	$142,727,097.87
2A3	93364FAE1	$50,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$50,000,000.00
2A4	93364FAF8	$48,260,790.44	$278,488.51	$0.00	$0.00	$0.00	$0.00	$278,488.51	$47,982,301.93
3A1	93364FAG6	$780,044,975.65	$6,619,904.88	$0.00	$0.00	$0.00	$0.00	$6,619,904.88	$773,425,070.77
3A2	93364FAH4	$245,782,853.80	$2,085,852.95	$0.00	$0.00	$0.00	$0.00	$2,085,852.95	$243,697,000.85
3A3	93364FAJ0	$19,317,549.17	$163,939.70	$0.00	$0.00	$0.00	$0.00	$163,939.70	$19,153,609.47
3A4	93364FAK7	$46,391,022.10	$393,700.57	$0.00	$0.00	$0.00	$0.00	$393,700.57	$45,997,321.53
4A1	93364FAL5	$307,993,710.88	$229,319.68	$0.00	$0.00	$0.00	$0.00	$229,319.68	$307,764,391.20
4A2	93364FAM3	$260,837,637.97	$194,209.18	$0.00	$0.00	$0.00	$0.00	$194,209.18	$260,643,428.79

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Report - Principal (Continued)
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
4A3	93364FAN1	$12,000,514.90	$8,935.10	$0.00	$0.00	$0.00	$0.00	$8,935.10	$11,991,579.80
LB1	93364FAP6	$25,428,211.58	$2,981.58	$0.00	$0.00	$0.00	$0.00	$2,981.58	$25,425,230.00
LB2	93364FAQ4	$10,594,338.41	$1,242.24	$0.00	$0.00	$0.00	$0.00	$1,242.24	$10,593,096.17
LB3	93364FAR2	$7,416,436.75	$869.61	$0.00	$0.00	$0.00	$0.00	$869.61	$7,415,567.14
LB4	93364FAZ4	$6,356,802.98	$745.36	$0.00	$0.00	$0.00	$0.00	$745.36	$6,356,057.62
LB5	93364FBA8	$4,767,352.32	$558.99	$0.00	$0.00	$0.00	$0.00	$558.99	$4,766,793.33
LB6	93364FBB6	$3,708,999.62	$434.90	$0.00	$0.00	$0.00	$0.00	$434.90	$3,708,564.72
3B1	93364FAS0	$23,189,136.47	$629.90	$0.00	$0.00	$0.00	$0.00	$629.90	$23,188,506.57
3B2	93364FAT8	$9,855,208.02	$267.70	$0.00	$0.00	$0.00	$0.00	$267.70	$9,854,940.32
3B3	93364FAU5	$4,637,627.31	$125.97	$0.00	$0.00	$0.00	$0.00	$125.97	$4,637,501.34
3B4	93364FBC4	$5,217,580.70	$141.73	$0.00	$0.00	$0.00	$0.00	$141.73	$5,217,438.97
3B5	93364FBD2	$4,057,673.92	$110.22	$0.00	$0.00	$0.00	$0.00	$110.22	$4,057,563.70
3B6	93364FBE0	$2,319,604.52	$62.95	$0.06	$0.00	$0.00	$0.00	$62.95	$2,319,541.51

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Report - Principal (Continued)
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
4B1	93364FAV3	$10,646,970.23	$338.64	$0.00	$0.00	$0.00	$0.00	$338.64	$10,646,631.59
4B2	93364FAW1	$4,258,588.12	$135.45	$0.00	$0.00	$0.00	$0.00	$135.45	$4,258,452.67
4B3	93364FAX9	$2,433,764.61	$77.41	$0.00	$0.00	$0.00	$0.00	$77.41	$2,433,687.20
4B4	93364FBF7	$2,433,764.61	$77.41	$0.00	$0.00	$0.00	$0.00	$77.41	$2,433,687.20
4B5	93364FBG5	$1,824,823.50	$58.04	$0.00	$0.00	$0.00	$0.00	$58.04	$1,824,765.46
4B6	93364FBH3	$1,217,310.70	$38.72	$0.00	$0.00	$0.00	$0.00	$38.72	$1,217,271.98
R	93364FAY7	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total *		$2,772,102,291.27	$14,894,275.57	$0.06	$0.00	$0.00	$0.00	$14,894,275.57	$2,757,208,015.64

*Total balances exclude notional balances.

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Report - Interest
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
1A1	$86,856,250.67	5.6442851112%	5.6442851112%	$408,534.54	$0.00	$0.00	$0.00	($0.02)	$0.00	$0.00	$408,534.52	$0.00
1A2	$5,055,590.65	5.6442851112%	5.6442851112%	$23,779.33	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$23,779.33	$0.00
2A1	$635,351,517.81	5.8888524083%	5.8888524083%	$3,117,909.43	$0.00	$0.00	$0.00	($0.14)	$0.00	$0.00	$3,117,909.29	$0.00
2A2	$143,845,682.86	5.8888524083%	5.8888524083%	$705,905.00	$0.00	$0.00	$0.00	($0.03)	$0.00	$0.00	$705,904.97	$0.00
2A3	$50,000,000.00	5.8888524083%	5.8888524083%	$245,368.85	$0.00	$0.00	$0.00	($0.01)	$0.00	$0.00	$245,368.84	$0.00
2A4	$48,260,790.44	5.8888524083%	5.8888524083%	$236,833.89	$0.00	$0.00	$0.00	($0.01)	$0.00	$0.00	$236,833.88	$0.00
3A1	$780,044,975.65	5.9169767030%	5.9169767030%	$3,846,256.62	$0.00	$0.00	$0.00	($0.18)	$0.00	$0.00	$3,846,256.44	$0.00
3A2	$245,782,853.80	5.9169767030%	5.9169767030%	$1,211,909.52	$0.00	$0.00	$0.00	($0.06)	$0.00	$0.00	$1,211,909.46	$0.00
3A3	$19,317,549.17	5.9169767030%	5.9169767030%	$95,251.24	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$95,251.24	$0.00
3A4	$46,391,022.10	5.9169767030%	5.9169767030%	$228,745.50	$0.00	$0.00	$0.00	($0.01)	$0.00	$0.00	$228,745.49	$0.00
4A1	$307,993,710.88	5.8765457055%	5.8765457055%	$1,508,282.60	$0.00	$0.00	$0.00	($0.07)	$0.00	$0.00	$1,508,282.53	$0.00
4A2	$260,837,637.97	5.8765457055%	5.8765457055%	$1,277,353.58	$0.00	$0.00	$0.00	($0.06)	$0.00	$0.00	$1,277,353.52	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Report - Interest (Continued)
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
4A3	$12,000,514.90	5.8765457055%	5.8765457055%	$58,767.98	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$58,767.98	$0.00
LB1	$25,428,211.58	5.8654146749%	5.8654146749%	$124,289.17	$0.00	$0.00	$0.00	($0.01)	$0.00	$0.00	$124,289.16	$0.00
LB2	$10,594,338.41	5.8654146749%	5.8654146749%	$51,783.49	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$51,783.49	$0.00
LB3	$7,416,436.75	5.8654146749%	5.8654146749%	$36,250.40	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$36,250.40	$0.00
LB4	$6,356,802.98	5.8654146749%	5.8654146749%	$31,071.07	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$31,071.07	$0.00
LB5	$4,767,352.32	5.8654146749%	5.8654146749%	$23,302.08	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$23,302.08	$0.00
LB6	$3,708,999.62	5.8654146749%	5.8654146749%	$18,129.02	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$18,129.02	$0.00
3B1	$23,189,136.47	5.9169767030%	5.9169767030%	$114,341.32	$0.00	$0.00	$0.00	($0.01)	$0.00	$0.00	$114,341.31	$0.00
3B2	$9,855,208.02	5.9169767030%	5.9169767030%	$48,594.20	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$48,594.20	$0.00
3B3	$4,637,627.31	5.9169767030%	5.9169767030%	$22,867.28	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$22,867.28	$0.00
3B4	$5,217,580.70	5.9169767030%	5.9169767030%	$25,726.92	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$25,726.92	$0.00
3B5	$4,057,673.92	5.9169767030%	5.9169767030%	$20,007.64	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$20,007.64	$0.00
3B6	$2,319,604.52	5.9169767030%	5.9169767030%	$11,437.54	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,437.54	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Certificate Payment Report - Interest (Continued)
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
4B1	$10,646,970.23	5.8765457055%	5.8765457055%	$52,139.51	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$52,139.51	$0.00
4B2	$4,258,588.12	5.8765457055%	5.8765457055%	$20,854.82	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$20,854.82	$0.00
4B3	$2,433,764.61	5.8765457055%	5.8765457055%	$11,918.44	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,918.44	$0.00
4B4	$2,433,764.61	5.8765457055%	5.8765457055%	$11,918.44	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,918.44	$0.00
4B5	$1,824,823.50	5.8765457055%	5.8765457055%	$8,936.38	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$8,936.38	$0.00
4B6	$1,217,310.70	5.8765457055%	5.8765457055%	$5,961.32	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,961.32	$0.00
R	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.54	$0.00
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$577.52	$0.00
Total *	$2,772,102,291.27			$13,604,427.12	$0.00	$0.00	$0.00	($0.63)	$0.00	$0.00	$13,604,427.03	$0.00

*Total balances exclude notional balances.

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Principal Factors Report
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
1A1	$90,935,000.00	955.14654061	0.00000000	0.00000000	0.00000000	0.00000000	1.31097223	0.9538355684	953.83556837
1A2	$5,293,000.00	955.14654260	0.00000000	0.00000000	0.00000000	0.00000000	1.31097298	0.9538355696	953.83556962
2A1	$655,523,000.00	969.22841427	0.00000000	0.00000000	0.00000000	0.00000000	5.59292496	0.9636354893	963.63548931
2A2	$150,000,000.00	958.97121907	0.00000000	0.00000000	0.00000000	0.00000000	7.45723327	0.9515139858	951.51398580
2A3	$50,000,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
2A4	$49,793,000.00	969.22841444	0.00000000	0.00000000	0.00000000	0.00000000	5.59292491	0.9636354895	963.63548953
3A1	$793,429,000.00	983.13141522	0.00000000	0.00000000	0.00000000	0.00000000	8.34341180	0.9747880034	974.78800343
3A2	$250,000,000.00	983.13141520	0.00000000	0.00000000	0.00000000	0.00000000	8.34341180	0.9747880034	974.78800340
3A3	$19,649,000.00	983.13141483	0.00000000	0.00000000	0.00000000	0.00000000	8.34341188	0.9747880030	974.78800295
3A4	$47,187,000.00	983.13141543	0.00000000	0.00000000	0.00000000	0.00000000	8.34341174	0.9747880037	974.78800369
4A1	$310,547,000.00	991.77809117	0.00000000	0.00000000	0.00000000	0.00000000	0.73843792	0.9910396533	991.03965326

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Principal Factors Report (Continued)
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
4A2	$263,000,000.00	991.77809114	0.00000000	0.00000000	0.00000000	0.00000000	0.73843795	0.9910396532	991.03965319
4A3	$12,100,000.00	991.77809091	0.00000000	0.00000000	0.00000000	0.00000000	0.73843802	0.9910396529	991.03965289
LB1	$25,437,000.00	999.65450250	0.00000000	0.00000000	0.00000000	0.00000000	0.11721429	0.9995372882	999.53728820
LB2	$10,598,000.00	999.65450179	0.00000000	0.00000000	0.00000000	0.00000000	0.11721457	0.9995372872	999.53728722
LB3	$7,419,000.00	999.65450195	0.00000000	0.00000000	0.00000000	0.00000000	0.11721391	0.9995372880	999.53728804
LB4	$6,359,000.00	999.65450228	0.00000000	0.00000000	0.00000000	0.00000000	0.11721340	0.9995372889	999.53728888
LB5	$4,769,000.00	999.65450199	0.00000000	0.00000000	0.00000000	0.00000000	0.11721325	0.9995372887	999.53728874
LB6	$3,710,281.54	999.65449522	0.00000000	0.00000000	0.00000000	0.00000000	0.11721482	0.9995372804	999.53728040
3B1	$23,191,000.00	999.91964426	0.00000000	0.00000000	0.00000000	0.00000000	0.02716140	0.9998924829	999.89248286
3B2	$9,856,000.00	999.91964489	0.00000000	0.00000000	0.00000000	0.00000000	0.02716112	0.9998924838	999.89248377
3B3	$4,638,000.00	999.91964424	0.00000000	0.00000000	0.00000000	0.00000000	0.02716041	0.9998924838	999.89248383
3B4	$5,218,000.00	999.91964354	0.00000000	0.00000000	0.00000000	0.00000000	0.02716175	0.9998924818	999.89248179
3B5	$4,058,000.00	999.91964515	0.00000000	0.00000000	0.00000000	0.00000000	0.02716116	0.9998924840	999.89248398

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Principal Factors Report (Continued)
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
3B6	$2,319,790.94	999.91963931	0.00002586	0.00000000	0.00000000	0.00000000	0.02713607	0.9998924774	999.89247738
4B1	$10,648,000.00	999.90328982	0.00000000	0.00000000	0.00000000	0.00000000	0.03180316	0.9998714867	999.87148666
4B2	$4,259,000.00	999.90329185	0.00000000	0.00000000	0.00000000	0.00000000	0.03180324	0.9998714886	999.87148861
4B3	$2,434,000.00	999.90329088	0.00000000	0.00000000	0.00000000	0.00000000	0.03180362	0.9998714873	999.87148726
4B4	$2,434,000.00	999.90329088	0.00000000	0.00000000	0.00000000	0.00000000	0.03180362	0.9998714873	999.87148726
4B5	$1,825,000.00	999.90328767	0.00000000	0.00000000	0.00000000	0.00000000	0.03180274	0.9998714849	999.87148493
4B6	$1,217,428.45	999.90327974	0.00000000	0.00000000	0.00000000	0.00000000	0.03180474	0.9998714750	999.87147499
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
TFEE	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Interest Factors Report
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
1A1	$90,935,000.00	5.6442851112%	5.6442851112%	4.49259955	0.00000000	0.00000000	0.00000000	-0.00000022	0.00000000	0.00000000	0.00000000	4.49259933	0.00000000
1A2	$5,293,000.00	5.6442851112%	5.6442851112%	4.49259966	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.49259966	0.00000000
2A1	$655,523,000.00	5.8888524083%	5.8888524083%	4.75636923	0.00000000	0.00000000	0.00000000	-0.00000021	0.00000000	0.00000000	0.00000000	4.75636902	0.00000000
2A2	$150,000,000.00	5.8888524083%	5.8888524083%	4.70603333	0.00000000	0.00000000	0.00000000	-0.00000020	0.00000000	0.00000000	0.00000000	4.70603313	0.00000000
2A3	$50,000,000.00	5.8888524083%	5.8888524083%	4.90737700	0.00000000	0.00000000	0.00000000	-0.00000020	0.00000000	0.00000000	0.00000000	4.90737680	0.00000000
2A4	$49,793,000.00	5.8888524083%	5.8888524083%	4.75636917	0.00000000	0.00000000	0.00000000	-0.00000020	0.00000000	0.00000000	0.00000000	4.75636897	0.00000000
3A1	$793,429,000.00	5.9169767030%	5.9169767030%	4.84763806	0.00000000	0.00000000	0.00000000	-0.00000023	0.00000000	0.00000000	0.00000000	4.84763784	0.00000000
3A2	$250,000,000.00	5.9169767030%	5.9169767030%	4.84763808	0.00000000	0.00000000	0.00000000	-0.00000024	0.00000000	0.00000000	0.00000000	4.84763784	0.00000000
3A3	$19,649,000.00	5.9169767030%	5.9169767030%	4.84763805	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.84763805	0.00000000
3A4	$47,187,000.00	5.9169767030%	5.9169767030%	4.84763812	0.00000000	0.00000000	0.00000000	-0.00000021	0.00000000	0.00000000	0.00000000	4.84763791	0.00000000
4A1	$310,547,000.00	5.8765457055%	5.8765457055%	4.85685774	0.00000000	0.00000000	0.00000000	-0.00000023	0.00000000	0.00000000	0.00000000	4.85685751	0.00000000

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Interest Factors Report (Continued)
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
4A2	$263,000,000.00	5.8765457055%	5.8765457055%	4.85685772	0.00000000	0.00000000	0.00000000	-0.00000023	0.00000000	0.00000000	0.00000000	4.85685749	0.00000000
4A3	$12,100,000.00	5.8765457055%	5.8765457055%	4.85685785	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.85685785	0.00000000
LB1	$25,437,000.00	5.8654146749%	5.8654146749%	4.88615678	0.00000000	0.00000000	0.00000000	-0.00000039	0.00000000	0.00000000	0.00000000	4.88615639	0.00000000
LB2	$10,598,000.00	5.8654146749%	5.8654146749%	4.88615682	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.88615682	0.00000000
LB3	$7,419,000.00	5.8654146749%	5.8654146749%	4.88615716	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.88615716	0.00000000
LB4	$6,359,000.00	5.8654146749%	5.8654146749%	4.88615663	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.88615663	0.00000000
LB5	$4,769,000.00	5.8654146749%	5.8654146749%	4.88615643	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.88615643	0.00000000
LB6	$3,710,281.54	5.8654146749%	5.8654146749%	4.88615751	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.88615751	0.00000000
3B1	$23,191,000.00	5.9169767030%	5.9169767030%	4.93041783	0.00000000	0.00000000	0.00000000	-0.00000043	0.00000000	0.00000000	0.00000000	4.93041740	0.00000000
3B2	$9,856,000.00	5.9169767030%	5.9169767030%	4.93041802	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.93041802	0.00000000
3B3	$4,638,000.00	5.9169767030%	5.9169767030%	4.93041828	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.93041828	0.00000000
3B4	$5,218,000.00	5.9169767030%	5.9169767030%	4.93041778	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.93041778	0.00000000
3B5	$4,058,000.00	5.9169767030%	5.9169767030%	4.93041893	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.93041893	0.00000000

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Interest Factors Report (Continued)
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
3B6	$2,319,790.94	5.9169767030%	5.9169767030%	4.93041843	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.93041843	0.00000000
4B1	$10,648,000.00	5.8765457055%	5.8765457055%	4.89664820	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.89664820	0.00000000
4B2	$4,259,000.00	5.8765457055%	5.8765457055%	4.89664710	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.89664710	0.00000000
4B3	$2,434,000.00	5.8765457055%	5.8765457055%	4.89664749	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.89664749	0.00000000
4B4	$2,434,000.00	5.8765457055%	5.8765457055%	4.89664749	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.89664749	0.00000000
4B5	$1,825,000.00	5.8765457055%	5.8765457055%	4.89664658	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.89664658	0.00000000
4B6	$1,217,428.45	5.8765457055%	5.8765457055%	4.89664916	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.89664916	0.00000000
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.40000000	0.00000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
TFEE	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8122
LOAN COUNT
Original Loan Count	132
Beginning Loan Count	125
Loans Added	0
Loans Prepaid-in-full	0
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	125
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$101,829,605.32
Beginning Scheduled Principal Balance	$97,496,263.03
Scheduled Principal Received or Advanced	$101,008.25
Unscheduled Principal	$30,929.57
Prepayments-in-full	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8122 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$97,364,325.21
INTEREST
Accrued Interest at Gross Rate	$489,048.21
Unscheduled Interest	$0.04
Uncollected Interest	$0.00
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8122 (Continued)
FEES
Servicing Fees	$30,467.60
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8123
LOAN COUNT
Original Loan Count	1301
Beginning Loan Count	1270
Loans Added	0
Loans Prepaid-in-full	8
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1262
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$958,006,776.22
Beginning Scheduled Principal Balance	$930,145,711.07
Scheduled Principal Received or Advanced	$18,485.35
Unscheduled Principal	$248,609.57
Prepayments-in-full	$4,797,316.63

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8123 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$925,081,299.52
INTEREST
Accrued Interest at Gross Rate	$5,010,271.01
Unscheduled Interest	$0.03
Uncollected Interest	($5,148.32)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8123 (Continued)
FEES
Servicing Fees	$445,694.99
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8124
LOAN COUNT
Original Loan Count	1366
Beginning Loan Count	1349
Loans Added	0
Loans Prepaid-in-full	4
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1345
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$1,159,545,790.94
Beginning Scheduled Principal Balance	$1,140,813,231.66
Scheduled Principal Received or Advanced	$30,988.45
Unscheduled Principal	$1,236,990.99
Prepayments-in-full	$7,996,757.19

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8124 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$1,131,548,495.03
INTEREST
Accrued Interest at Gross Rate	$5,981,642.78
Unscheduled Interest	($0.54)
Uncollected Interest	$0.00
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8124 (Continued)
FEES
Servicing Fees	$356,505.08
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8125
LOAN COUNT
Original Loan Count	726
Beginning Loan Count	722
Loans Added	0
Loans Prepaid-in-full	0
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	722
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$608,464,428.45
Beginning Scheduled Principal Balance	$603,647,085.55
Scheduled Principal Received or Advanced	$19,199.65
Unscheduled Principal	$413,989.97
Prepayments-in-full	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8125 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$603,213,895.93
INTEREST
Accrued Interest at Gross Rate	$3,081,893.19
Unscheduled Interest	($0.16)
Uncollected Interest	$0.00
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Pool 8125 (Continued)
FEES
Servicing Fees	$125,759.94
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Total
LOAN COUNT
Original Loan Count	3525
Beginning Loan Count	3466
Loans Added	0
Loans Prepaid-in-full	12
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	3454
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$2,827,846,600.93
Beginning Scheduled Principal Balance	$2,772,102,291.31
Scheduled Principal Received or Advanced	$169,681.70
Unscheduled Principal	$1,930,520.10
Prepayments-in-full	$12,794,073.82

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Total (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$2,757,208,015.69
INTEREST
Accrued Interest at Gross Rate	$14,562,855.19
Unscheduled Interest	($0.63)
Uncollected Interest	($5,148.32)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Collateral Report Total (Continued)
FEES
Servicing Fees	$958,427.61
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Delinquency Information by Group*
Group ID	1 Month Count	Scheduled Ending Balance	2 Months Count	Scheduled Ending Balance	3 Months Count	Scheduled Ending Balance	4+ Months Count	Scheduled Ending Balance
Pool 8122	1	$683,845.02	0	$0.00	0	$0.00	0	$0.00
Pool 8123	40	$25,553,529.76	4	$3,300,457.22	2	$1,413,129.27	0	$0.00
Pool 8124	16	$9,869,409.63	1	$535,000.00	1	$828,800.00	0	$0.00
Pool 8125	5	$4,656,305.45	0	$0.00	2	$1,049,781.12	0	$0.00
Aggregate	62	$40,763,089.86	5	$3,835,457.22	5	$3,291,710.39	0	$0.00

* Does not include mortgage loans in foreclosure or REO.

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Foreclosure, REO, and Bankruptcy by Group**
Group ID	Foreclosure Count	Scheduled Ending Balance	REO Count	Scheduled Ending Balance	Bankruptcy Count	Scheduled Ending Balance
Pool 8122	1	$985,689.94	0	$0.00	0	$0.00
Pool 8123	2	$944,500.00	0	$0.00	1	$518,457.22
Pool 8124	0	$0.00	0	$0.00	0	$0.00
Pool 8125	0	$0.00	0	$0.00	0	$0.00
Aggregate	3	$1,930,189.94	0	$0.00	1	$518,457.22

** Loans in Bankruptcy will also be reflected under their applicable delinquency or foreclosure status.

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Aggregate Loss Amount by Group
Group ID	Count	Loss Amount
Pool 8122	0	$0.00
Pool 8123	0	$0.00
Pool 8124	0	$0.00
Pool 8125	0	$0.00
Aggregate	0	$0.00

Servicer Advances by Group
Group	Count	Total
Pool 8122	107	$498,277.30
Pool 8123	1147	$4,260,860.46
Pool 8124	1183	$4,877,531.99
Pool 8125	645	$2,674,732.44
Aggregate	3082	$12,311,402.19

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Stop Advances Loans
Group	Count	Loan Balance	Total Scheduled P&I
Pool 8122	0	$0.00	$0.00
Pool 8123	0	$0.00	$0.00
Pool 8124	0	$0.00	$0.00
Pool 8125	0	$0.00	$0.00
Aggregate	0	$0.00	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Delinquency Roll Rates-Aggregate***
Current Value	Current		1 Month		2 Months		3 Months
Prior Value	Count	Balance	Count	Balance	Count	Balance	Count	Balance
Current	3360	$2,694,192,663.65	50	$32,423,789.86	0	$0.00	0	$0.00
Delq 1 Month	18	$12,197,871.50	10	$7,419,300.00	5	$3,835,457.22	0	$0.00
Delq 2 Month	1	$997,033.13	2	$920,000.00	0	$0.00	5	$3,291,710.39
Delq 3 Month	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Delq 4 Month	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Foreclosure	0	$0.00	0	$0.00	0	$0.00	0	$0.00

Current Value	4+ Months		Foreclosure		REO
Prior Value	Count	Balance	Count	Balance	Count	Balance
Current	0	$0.00	0	$0.00	0	$0.00
Delq 1 Month	0	$0.00	0	$0.00	0	$0.00
Delq 2 Month	0	$0.00	0	$0.00	0	$0.00
Delq 3 Month	0	$0.00	0	$0.00	0	$0.00
Delq 4 Month	0	$0.00	0	$0.00	0	$0.00
Foreclosure	0	$0.00	3	$1,930,189.94	0	$0.00

*** To use this chart, locate along the Current Value row the desired delinquency status as of the immediately preceding due date (e.g. Current, 1 Month delinquent, etc.). Use the left hand column labeled Prior Value to see the prior month's value. Follow the selected Current Value column to the desired Prior Value row.

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Credit Enhancement
Type	Original Balance	Beginning Balance	Reduction	Increase	Ending Balance
Over Collateralization	$0.00	$0.00	$0.00	$0.00	$0.00
Reserve Account	$0.00	$0.00	$0.00	$0.00	$0.00
Other	$0.00	$0.00	$0.00	$0.00	$0.00

Insurance
Insurance Type	Original Balance	Claims Paid	Coverage Remaining
Pool Insurance	$0.00	$0.00	$0.00
Other	$0.00	$0.00	$0.00

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Subordinate Class Certificate Balances
The Class Principal Balances of each Class of the Class 4B1,4B2,4B3,4B4,4B5,4B6 Certificates immediately after the principal and interest distribution on 10/25/2007 are as follows:
Class	Ending Principal Balance	Percentage of Aggregate Certificate Principal Balance on Closing Date	Percentage of Aggregate Certificate Ending Principal Balance
4B1	$10,646,631.59	0.38%	0.39%
4B2	$4,258,452.67	0.15%	0.15%
4B3	$2,433,687.20	0.09%	0.09%
4B4	$2,433,687.20	0.09%	0.09%
4B5	$1,824,765.46	0.06%	0.07%
4B6	$1,217,271.98	0.04%	0.04%
Total	$22,814,496.10	0.81%	0.83%

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Subordinate Class Certificate Balances
The Class Principal Balances of each Class of the Class 3B1,3B2,3B3,3B4,3B5,3B6 Certificates immediately after the principal and interest distribution on 10/25/2007 are as follows:
Class	Ending Principal Balance	Percentage of Aggregate Certificate Principal Balance on Closing Date	Percentage of Aggregate Certificate Ending Principal Balance
3B1	$23,188,506.57	0.82%	0.84%
3B2	$9,854,940.32	0.35%	0.36%
3B3	$4,637,501.34	0.16%	0.17%
3B4	$5,217,438.97	0.18%	0.19%
3B5	$4,057,563.70	0.14%	0.15%
3B6	$2,319,541.51	0.08%	0.08%
Total	$49,275,492.41	1.74%	1.79%

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Subordinate Class Certificate Balances
The Class Principal Balances of each Class of the Class LB1,LB2,LB3,LB4,LB5,LB6 Certificates immediately after the principal and interest distribution on 10/25/2007 are as follows:
Class	Ending Principal Balance	Percentage of Aggregate Certificate Principal Balance on Closing Date	Percentage of Aggregate Certificate Ending Principal Balance
LB1	$25,425,230.00	0.90%	0.92%
LB2	$10,593,096.17	0.37%	0.38%
LB3	$7,415,567.14	0.26%	0.27%
LB4	$6,356,057.62	0.22%	0.23%
LB5	$4,766,793.33	0.17%	0.17%
LB6	$3,708,564.72	0.13%	0.13%
Total	$58,265,308.98	2.06%	2.11%

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Glossary of Terms
TERM	DEFINITION
Average Ending Scheduled Principal Balance	Average scheduled principal balance of all mortgage loans as of the immediately preceding due date.
Compensating Interest	Interest paid by the servicer or master servicer in respect of Prepayment Interest Shortfall, subject to specified caps.
CPR (Constant Prepayment Rate)	The annualized, compounded single month mortality rate.
Current Interest Accrued	The interest accrued for the current month's distribution.
Deferred Interest	When a scheduled monthly payment is less than required to satisfy the note rate, the unpaid interest is deferred by adding it to the loan balance and the certificate balances.
Excess Liquidation Proceeds	Funds received at the time of liquidation in excess of the amount needed to satisfy the outstanding scheduled principal balance and related expenses.
Interest Rate Accrued	The rate at which interest is accrued for the current month's distribution.
Interest Rate Paid	The rate at which interest is paid for the current month's distribution.
Uncollected Interest	Interest not collected on delinquent loans for which scheduled payments are no longer being advanced, interest uncollected on prepayments and interest uncollected on liquidations.
Other Interest Shortfall	Any interest shortfall other than Uncompensated Interest Shortfall, Deferred Interest or Interest Uncollected on Non-Earning Assets.
Over Collateralization	Any excess of the aggregate principal balance of the mortgage loans over the aggregate principal balance of the certificates.
Prefunding Amount	The amount of cash being held for future loan purchases.

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Glossary of Terms (Continued)
TERM	DEFINITION
Prepayment Interest Shortfall	Any shortfall in collections of interest on mortgage loans resulting from prepayments in full or partial prepayments.
Principal Loss	The amount of principal reduction due to a loss realized on the mortgage loans.
Principal Reimbursed	The amount of principal passed through as a reimbursement.
PSA (Prepayment Speed Assumption)	A prepayment model that in its base case (stated as 100% PSA), assumes that prepayments start in month one at an annual CPR of 0.2%, rising linearly to 6.0% CPR in month 30, and then remain flat at 6.0% CPR thereafter.
Relief Act Shortfall	Interest shortfall resulting from application of the Servicemembers Civil Relief Act.
REO (Real Estate Owned)	Property acquired by the trust through foreclosure or deed-in-lieu of foreclosure on a defaulted loan.
Reserve Account	Funded or non-funded accounts set up at either the property or portfolio level in in anticipation of periodic or non-periodic capital expenditures or cash needs.
Servicer Advances	Scheduled principal and interest advances made by the servicer or master servicer for delinquent mortgage loans.
Servicing Fees	The monthly fee paid to the servicer to perform primary servicing function for the master servicer with respect to the mortgage loans and if applicable the fee charged by the master servicer for supervising the mortgage loan servicing.
SMM (Single Month Mortality)	In any given month, the SMM measures the percentage of the beginning pool balance that was paid back earlier than scheduled through payoffs.
Stop Advance	The amount of principal and interest on delinquent mortgage loans for which scheduled payments are no longer being advanced.
Subsequent Recoveries	The amount of funds recovered on mortgage loans that were previously liquidated at a loss.
Trigger Event	An event that may require a change in payment priority.

Series: WAMU 2007-HY7	Washington Mutual
Issue Date: 06/25/2007
Record Date: 09/28/2007
Distribution Date: 10/25/2007

Glossary of Terms (Continued)
TERM	DEFINITION
Unscheduled Interest	Interested collected in addition to the scheduled interest payment.
Unscheduled Principal	Payments of principal which were received with respect to any mortgage loan during the prior period, other than monthly scheduled principal, prepayments in full, repurchases, liquidation principal and subsequent recoveries.
Weighted Average Loan Age	For any distribution date, the weighted average of the loan age on the mortgage loans as of the immediately preceding due date.
Weighted Average Mortgage Interest Rate	For any distribution date, the weighted average of the mortgage interest rates on the mortgage loans as of the second preceding due date (after giving effect to the payments due on the mortgage loans on that due date).
Weighted Average Pass Through Rate	For any distribution date, the weighted average of the pass-through rates on the mortgage loans as of the second preceding due date (after giving effect to the payments due on the mortgage loans on that due date).
Weighted Average Remaining Term	For any distribution date, the weighted average of the maturity on the mortgage loans as of the immediately preceding due date.
MBA Delinquency Calculation	In this calculation, a loan increases its delinquency status if a monthly payment is not received by the end of the day immediately preceding the loan's next due date.
OTS Delinquency Calculation	In this calculation, a loan increases its delinquency status if a monthly payment is not received by the loan's due date in the following month.

WaMu Mortgage Pass-Through Certificates, Series 2007-HY7 10-D