WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Subsequent Recoveries	Total Dist	Ending Class Bal
IA1	939336UE1	$419,828,000.00	$256,669,072.93	5.0000000000%	5.0000000000%	$1,069,454.47	$5,371,980.09	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,441,434.56	$251,297,092.84
IA2	939336UF8	$150,000,000.00	$91,705,081.47	4.5000000000%	4.5000000000%	$343,894.06	$1,919,350.34	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,263,244.39	$89,785,731.13
IA3	939336UG6	$2,700,000.00	$1,650,691.47	5.0000000000%	5.0000000000%	$6,877.88	$34,548.31	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$41,426.19	$1,616,143.16
IA4	939336UH4	$41,666,000.00	$25,473,226.16	1.6250000000%	1.6250000000%	$34,494.99	$533,144.34	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$567,639.33	$24,940,081.82
IA5	939336UJ0	$41,666,000.00	$25,473,226.16	6.3750000000%	6.3750000000%	$135,326.51	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$135,326.51	$24,940,081.82
IA6	939336UK7	$100,000,000.00	$61,136,720.97	4.5000000000%	4.5000000000%	$229,262.70	$1,279,566.89	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,508,829.59	$59,857,154.08
IIA	939336UL5	$92,613,000.00	$58,942,643.07	5.0000000000%	5.0000000000%	$245,594.35	$686,537.03	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$932,131.37	$58,256,106.04
IIIA	939336UM3	$25,000,000.00	$14,264,790.36	5.0000000000%	5.0000000000%	$59,436.63	$70,103.30	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$129,539.93	$14,194,687.06
CX	939336UN1	$58,162,343.00	$32,441,295.52	5.0000000000%	4.9999999996%	$135,172.06	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$135,172.06	$31,765,386.66
CP	939336UP6	$1,502,546.00	$1,291,259.18	0.0000000000%	0.0000000000%	$0.00	$56,812.98	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$56,812.98	$1,234,446.20
CB1	939336UQ4	$5,060,000.00	$4,891,901.84	5.0000000000%	5.0000000000%	$20,382.92	$19,268.20	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$39,651.12	$4,872,633.64
CB2	939336UR2	$2,109,000.00	$2,038,936.94	5.0000000000%	5.0000000000%	$8,495.57	$8,030.95	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$16,526.52	$2,030,905.99
CB3	939336US0	$843,000.00	$814,994.72	5.0000000000%	5.0000000000%	$3,395.81	$3,210.10	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,605.91	$811,784.62
CB4	939336UU5	$843,000.00	$814,994.72	5.0000000000%	5.0000000000%	$3,395.81	$3,210.10	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,605.91	$811,784.62
CB5	939336UV3	$422,000.00	$407,980.74	5.0000000000%	5.0000000000%	$1,699.92	$1,606.95	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,306.87	$406,373.79
CB6	939336UW1	$844,321.79	$816,272.58	5.0000000000%	5.0000000000%	$3,401.14	$3,215.13	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,616.27	$813,057.45
R	939336UT8	$100.00	$0.00	0.0000000000%	0.0000000000%	$1.13	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1.13	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total		$843,430,967.79	$520,918,567.15			$2,300,285.96	$9,990,584.69	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$12,290,870.65	$510,927,982.46

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$419,828,000.00	$256,669,072.93	$0.00	$0.00	$0.00	$0.00	$5,371,980.09	0.5985715408	$251,297,092.84
IA2	$150,000,000.00	$91,705,081.47	$0.00	$0.00	$0.00	$0.00	$1,919,350.34	0.5985715409	$89,785,731.13
IA3	$2,700,000.00	$1,650,691.47	$0.00	$0.00	$0.00	$0.00	$34,548.31	0.5985715407	$1,616,143.16
IA4	$41,666,000.00	$25,473,226.16	$0.00	$0.00	$0.00	$0.00	$533,144.34	0.5985715408	$24,940,081.82
IA5	$41,666,000.00	$25,473,226.16	$0.00	$0.00	$0.00	$0.00	$0.00	0.5985715408	$24,940,081.82
IA6	$100,000,000.00	$61,136,720.97	$0.00	$0.00	$0.00	$0.00	$1,279,566.89	0.5985715408	$59,857,154.08
IIA	$92,613,000.00	$58,942,643.07	$0.00	$0.00	$0.00	$0.00	$686,537.03	0.6290273076	$58,256,106.04
IIIA	$25,000,000.00	$14,264,790.36	$0.00	$0.00	$0.00	$0.00	$70,103.30	0.5677874824	$14,194,687.06
CX	$58,162,343.00	$32,441,295.52	$0.00	$0.00	$0.00	$0.00	$0.00	0.5461503960	$31,765,386.66
CP	$1,502,546.00	$1,291,259.18	$0.00	$0.00	$0.00	$0.00	$56,812.98	0.8215696558	$1,234,446.20
CB1	$5,060,000.00	$4,891,901.84	$0.00	$0.00	$0.00	$0.00	$19,268.20	0.9629710751	$4,872,633.64
CB2	$2,109,000.00	$2,038,936.94	$0.00	$0.00	$0.00	$0.00	$8,030.95	0.9629710716	$2,030,905.99
CB3	$843,000.00	$814,994.72	$0.00	$0.00	$0.00	$0.00	$3,210.10	0.9629710795	$811,784.62
CB4	$843,000.00	$814,994.72	$0.00	$0.00	$0.00	$0.00	$3,210.10	0.9629710795	$811,784.62
CB5	$422,000.00	$407,980.74	$0.00	$0.00	$0.00	$0.00	$1,606.95	0.9629710664	$406,373.79
CB6	$844,321.79	$816,272.58	$0.00	$0.00	$0.00	$0.00	$3,215.13	0.9629710611	$813,057.45
R	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$843,430,967.79	$520,918,567.15	$0.00	$0.00	$0.00	$0.00	$9,990,584.69	0.6057733258	$510,927,982.46

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$419,828,000.00	611.36720974	0.00000000	0.00000000	0.00000000	0.00000000	12.79566892	0.5985715408	598.57154082
IA2	$150,000,000.00	611.36720980	0.00000000	0.00000000	0.00000000	0.00000000	12.79566893	0.5985715409	598.57154087
IA3	$2,700,000.00	611.36721111	0.00000000	0.00000000	0.00000000	0.00000000	12.79567037	0.5985715407	598.57154074
IA4	$41,666,000.00	611.36720972	0.00000000	0.00000000	0.00000000	0.00000000	12.79566889	0.5985715408	598.57154082
IA5	$41,666,000.00	611.36720972	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.5985715408	598.57154082
IA6	$100,000,000.00	611.36720970	0.00000000	0.00000000	0.00000000	0.00000000	12.79566890	0.5985715408	598.57154080
IIA	$92,613,000.00	636.44027372	0.00000000	0.00000000	0.00000000	0.00000000	7.41296611	0.6290273076	629.02730761
IIIA	$25,000,000.00	570.59161440	0.00000000	0.00000000	0.00000000	0.00000000	2.80413200	0.5677874824	567.78748240
CX	$58,162,343.00	557.77146942	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.5461503960	546.15039597
CP	$1,502,546.00	859.38079766	0.00000000	0.00000000	0.00000000	0.00000000	37.81114189	0.8215696558	821.56965577
CB1	$5,060,000.00	966.77901976	0.00000000	0.00000000	0.00000000	0.00000000	3.80794466	0.9629710751	962.97107510
CB2	$2,109,000.00	966.77901375	0.00000000	0.00000000	0.00000000	0.00000000	3.80794215	0.9629710716	962.97107160
CB3	$843,000.00	966.77902728	0.00000000	0.00000000	0.00000000	0.00000000	3.80794781	0.9629710795	962.97107948
CB4	$843,000.00	966.77902728	0.00000000	0.00000000	0.00000000	0.00000000	3.80794781	0.9629710795	962.97107948
CB5	$422,000.00	966.77900474	0.00000000	0.00000000	0.00000000	0.00000000	3.80793839	0.9629710664	962.97106635
CB6	$844,321.79	966.77900496	0.00000000	0.00000000	0.00000000	0.00000000	3.80794389	0.9629710611	962.97106107
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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA1	$419,828,000.00	5.0000000000%	5.0000000000%	$256,669,072.93	$1,069,454.47	$0.00	$0.00	$0.00	$1,069,454.47
IA2	$150,000,000.00	4.5000000000%	4.5000000000%	$91,705,081.47	$343,894.06	$0.00	$0.00	$0.00	$343,894.06
IA3	$2,700,000.00	5.0000000000%	5.0000000000%	$1,650,691.47	$6,877.88	$0.00	$0.00	$0.00	$6,877.88
IA4	$41,666,000.00	1.6250000000%	1.6250000000%	$25,473,226.16	$34,494.99	$0.00	$0.00	$0.00	$34,494.99
IA5	$41,666,000.00	6.3750000000%	6.3750000000%	$25,473,226.16	$135,326.51	$0.00	$0.00	$0.00	$135,326.51
IA6	$100,000,000.00	4.5000000000%	4.5000000000%	$61,136,720.97	$229,262.70	$0.00	$0.00	$0.00	$229,262.70
IIA	$92,613,000.00	5.0000000000%	5.0000000000%	$58,942,643.07	$245,594.35	$0.00	$0.00	$0.00	$245,594.35
IIIA	$25,000,000.00	5.0000000000%	5.0000000000%	$14,264,790.36	$59,436.63	$0.00	$0.00	$0.00	$59,436.63
CX	$58,162,343.00	5.0000000000%	4.9999999996%	$32,441,295.52	$135,172.06	$0.00	$0.00	$0.00	$135,172.06
CP	$1,502,546.00	0.0000000000%	0.0000000000%	$1,291,259.18	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$5,060,000.00	5.0000000000%	5.0000000000%	$4,891,901.84	$20,382.92	$0.00	$0.00	$0.00	$20,382.92
CB2	$2,109,000.00	5.0000000000%	5.0000000000%	$2,038,936.94	$8,495.57	$0.00	$0.00	$0.00	$8,495.57
CB3	$843,000.00	5.0000000000%	5.0000000000%	$814,994.72	$3,395.81	$0.00	$0.00	$0.00	$3,395.81
CB4	$843,000.00	5.0000000000%	5.0000000000%	$814,994.72	$3,395.81	$0.00	$0.00	$0.00	$3,395.81
CB5	$422,000.00	5.0000000000%	5.0000000000%	$407,980.74	$1,699.92	$0.00	$0.00	$0.00	$1,699.92
CB6	$844,321.79	5.0000000000%	5.0000000000%	$816,272.58	$3,401.14	$0.00	$0.00	$0.00	$3,401.14
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$1.13	$0.00	$0.00	$0.00	$1.13
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$843,430,967.79			$520,918,567.15	$2,300,285.96	$0.00	$0.00	$0.00	$2,300,285.96

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA1	$419,828,000.00	5.0000000000%	5.0000000000%	611.36720974	2.54736337	0.00000000	0.00000000	0.00000000	2.54736337
IA2	$150,000,000.00	4.5000000000%	4.5000000000%	611.36720980	2.29262707	0.00000000	0.00000000	0.00000000	2.29262707
IA3	$2,700,000.00	5.0000000000%	5.0000000000%	611.36721111	2.54736296	0.00000000	0.00000000	0.00000000	2.54736296
IA4	$41,666,000.00	1.6250000000%	1.6250000000%	611.36720972	0.82789301	0.00000000	0.00000000	0.00000000	0.82789301
IA5	$41,666,000.00	6.3750000000%	6.3750000000%	611.36720972	3.24788821	0.00000000	0.00000000	0.00000000	3.24788821
IA6	$100,000,000.00	4.5000000000%	4.5000000000%	611.36720970	2.29262700	0.00000000	0.00000000	0.00000000	2.29262700
IIA	$92,613,000.00	5.0000000000%	5.0000000000%	636.44027372	2.65183452	0.00000000	0.00000000	0.00000000	2.65183452
IIIA	$25,000,000.00	5.0000000000%	5.0000000000%	570.59161440	2.37746520	0.00000000	0.00000000	0.00000000	2.37746520
CX	$58,162,343.00	5.0000000000%	4.9999999996%	557.77146942	2.32404771	0.00000000	0.00000000	0.00000000	2.32404771
CP	$1,502,546.00	0.0000000000%	0.0000000000%	859.38079766	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$5,060,000.00	5.0000000000%	5.0000000000%	966.77901976	4.02824506	0.00000000	0.00000000	0.00000000	4.02824506
CB2	$2,109,000.00	5.0000000000%	5.0000000000%	966.77901375	4.02824561	0.00000000	0.00000000	0.00000000	4.02824561
CB3	$843,000.00	5.0000000000%	5.0000000000%	966.77902728	4.02824437	0.00000000	0.00000000	0.00000000	4.02824437
CB4	$843,000.00	5.0000000000%	5.0000000000%	966.77902728	4.02824437	0.00000000	0.00000000	0.00000000	4.02824437
CB5	$422,000.00	5.0000000000%	5.0000000000%	966.77900474	4.02824645	0.00000000	0.00000000	0.00000000	4.02824645
CB6	$844,321.79	5.0000000000%	5.0000000000%	966.77900496	4.02825089	0.00000000	0.00000000	0.00000000	4.02825089
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	11.30000000	0.00000000	0.00000000	0.00000000	11.30000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMMS 03MS5
WEIGHTED AVERAGE PC RATE: 5.29899%
WEIGHTED AVERAGE MATURITY: 167.15047
WEIGHTED AVERAGE LOAN AGE: 11.09690
POOL NUMBER: Group 1(2041,2042,2043)
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $843,430,968.56
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1125		$520,918,567.94
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,052,952.33
Unscheduled Principal Collection/Reversals		$627,276.40
Liquidations-in-full	15	$7,310,355.96
Subsequent Recoveries		$0.00
Net principal Distributed		$9,990,584.69	-$9,990,584.69

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1110		$510,927,983.25

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,430,515.33

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$130,229.37

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$12,290,870.65

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMMS 03MS5
WEIGHTED AVERAGE PC RATE: 5.30124%
WEIGHTED AVERAGE MATURITY: 167.30284
WEIGHTED AVERAGE LOAN AGE: 11.07437
POOL NUMBER: 2041
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $724,385,214.90
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	963		$446,338,870.26
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$1,755,001.22
Unscheduled Principal Collection/Reversals		$571,080.27
Liquidations-in-full	14	$6,902,366.26
Subsequent Recoveries		$0.00
Net principal Distributed		$9,228,447.75	-$9,228,447.75

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	949		$437,110,422.51

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,083,377.15

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$111,584.51

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$11,200,240.39

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMMS 03MS5
WEIGHTED AVERAGE PC RATE: 5.28782%
WEIGHTED AVERAGE MATURITY: 166.52415
WEIGHTED AVERAGE LOAN AGE: 11.03392
POOL NUMBER: 2042
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $93,839,657.72
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	128		$60,118,466.94
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$238,929.60
Unscheduled Principal Collection/Reversals		$44,292.79
Liquidations-in-full	1	$407,989.70
Subsequent Recoveries		$0.00
Net principal Distributed		$691,212.09	-$691,212.09

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	127		$59,427,254.85

SCHEDULED INTEREST AT MORTGAGE RATE:		$279,942.45

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$15,029.57

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$956,124.97

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMMS 03MS5
WEIGHTED AVERAGE PC RATE: 5.27593%
WEIGHTED AVERAGE MATURITY: 165.10886
WEIGHTED AVERAGE LOAN AGE: 12.04145
POOL NUMBER: 2043
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $25,206,095.94
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	34		$14,461,230.74
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$59,021.51
Unscheduled Principal Collection/Reversals		$11,903.34
Liquidations-in-full	0	$0.00
Subsequent Recoveries		$0.00
Net principal Distributed		$70,924.85	-$70,924.85

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	34		$14,390,305.89

SCHEDULED INTEREST AT MORTGAGE RATE:		$67,195.73

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$3,615.29

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$134,505.29

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMMS 03MS5
WEIGHTED AVERAGE PC RATE: 5.29899%
WEIGHTED AVERAGE MATURITY: 167.15047
WEIGHTED AVERAGE LOAN AGE: 11.09690
POOL NUMBER: ALL
ISSUE DATE: 02/28/2003
CERTIFICATE BALANCE AT ISSUE: $843,430,968.56
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1125		$520,918,567.94
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$2,052,952.33
Unscheduled Principal Collection/Reversals		$627,276.40
Liquidations-in-full	15	$7,310,355.96
Subsequent Recoveries		$0.00
Net principal Distributed		$9,990,584.69	-$9,990,584.69

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1110		$510,927,983.25

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,430,515.33

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$130,229.37

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$12,290,870.65

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(2041,2042,2043)		$9,990,584.69		$2,300,285.96		$12,290,870.65
Pool - 2041		$9,228,447.75		$1,971,792.64		$11,200,240.39
Pool - 2042		$691,212.09		$264,912.88		$956,124.97
Pool - 2043		$70,924.85		$63,580.44		$134,505.29
Aggregate		$9,990,584.69		$2,300,285.96		$12,290,870.65

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Group 1(2041,2042,2043)	$520,918,567.94	1125	15	1110	$510,927,983.25	$2,052,952.33	$7,310,355.96	$627,276.40	$9,990,584.69
Pool - 2041	$446,338,870.26	963	14	949	$437,110,422.51	$1,755,001.22	$6,902,366.26	$571,080.27	$9,228,447.75
Pool - 2042	$60,118,466.94	128	1	127	$59,427,254.85	$238,929.60	$407,989.70	$44,292.79	$691,212.09
Pool - 2043	$14,461,230.74	34	0	34	$14,390,305.89	$59,021.51	$0.00	$11,903.34	$70,924.85
Aggregate	$520,918,567.94	1125	15	1110	$510,927,983.25	$2,052,952.33	$7,310,355.96	$627,276.40	$9,990,584.69

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Group 1(2041,2042,2043)	5	$2,518,813.99	0	$0.00	0	$0.00	0	$0.00
Pool - 2041	4	$2,040,681.73	0	$0.00	0	$0.00	0	$0.00
Pool - 2042	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool - 2043	1	$478,132.26	0	$0.00	0	$0.00	0	$0.00
Aggregate	5	$2,518,813.99	0	$0.00	0	$0.00	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Group 1(2041,2042,2043)		0		$0.00		0		$0.00
Pool - 2041		0		$0.00		0		$0.00
Pool - 2042		0		$0.00		0		$0.00
Pool - 2043		0		$0.00		0		$0.00
Aggregate		0		$0.00		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(2041,2042,2043)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003

INSURANCE RESERVES - Group 1(2041,2042,2043)
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$13,532,036.00	$0.00	$0.00	$0.00	$13,532,036.00
Bankruptcy Bond
Single-Units	$100,000.00	$0.00	$0.00	$0.00	$100,000.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$8,434,309.00	$0.00	$0.00	$0.00	$8,434,309.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$13,532,036.00	$0.00	$0.00	$0.00	$13,532,036.00
Bankruptcy Bond
Single-Units	$100,000.00	$0.00	$0.00	$0.00	$100,000.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$8,434,309.00	$0.00	$0.00	$0.00	$8,434,309.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.03MS5
Distribution Date: 12/26/2003

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I, II, and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated February 26, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain Group I, II, and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, II, and III Loans, subject to the conditions and limitations to payment specified thereunder.



The Class Principal Balances of each Class of the Class CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200312 are as follows:

Class			Class Principal Balance
CB1			$4,872,633.64
CB2			$2,030,905.99
CB3			$811,784.62
CB4			$811,784.62
CB5			$406,373.79
CB6			$813,057.45
Total			$9,746,540.12
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $13,532,036.00, $100,000.00, $8,434,309.00 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."

WASHINGTON MUTUAL MORTGAGE SEC CORP PAS THRU CERTS 2003MS5 8-K