WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

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	939335KP9	$80,000,000.00	$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
IA2	939335KQ7	$34,786,000.00	$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
IA3	939335KR5	$7,590,000.00	$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
IA4	939335KS3	$22,587,171.00	$8,685,026.54	6.7500000000%	6.7500000000%	$48,853.27	$1,789,103.18	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,837,956.46	$6,895,923.36
IA5	939335KT1	$3,750,000.00	$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
IA6	939335KU8	$3,490,000.00	$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
IA7	939335KV6	$4,533,000.00	$0.13	7.0000000000%	7.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.13
IA8	939335KW4	$717,149.00	$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
IA9	939335KX2	$70,000,000.00	$0.02	6.5000000000%	6.5000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.02
IA10	939335KY0	$2,592,592.00	$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
IA11	939335KZ7	$176,000.00	$67,674.02	6.7500000000%	6.7500000000%	$380.67	$13,940.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$14,321.42	$53,733.27
IIA1	939335LA1	$49,602,806.00	$3,619,721.10	6.5000000000%	6.5000000000%	$19,606.82	$492,807.84	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$512,414.66	$3,126,913.26
IIA2	939335LB9	$100,000,000.00	$7,297,411.97	6.5000000000%	6.5000000000%	$39,527.65	$993,507.99	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,033,035.64	$6,303,903.98
IIA3	939335LC7	$920,000.00	$67,136.19	6.5000000000%	6.5000000000%	$363.65	$9,140.27	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,503.93	$57,995.92
IIIA1	939335LD5	$354,937,000.00	$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
IIIA2	939335LE3	$31,650,000.00	$0.02	6.7500000000%	6.7500000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.02
IIIA3	939335LF0	$15,329,000.00	$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
IIIA4	939335LG8	$54,500,070.00	$34,127,573.34	6.7500000000%	6.7500000000%	$191,967.60	$7,475,246.92	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$7,667,214.52	$26,652,326.42
IIIA5	939335LH6	$50,000,000.00	$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
IIIA6	939335LJ2	$500,000.00	$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
IIIA7	939335LK9	$500,000.00	$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
IIIA8	939335LL7	$500,000.00	$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
IIIA9	939335LM5	$500,000.00	$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
IIIA10	939335LN3	$500,000.00	$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
IIIA11	939335LP8	$500,000.00	$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
IIIA12	939335LQ6	$500,000.00	$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
IIIA13	939335LR4	$500,000.00	$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
IIIA14	939335LS2	$500,000.00	$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
IIIA15	939335LT0	$500,000.00	$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
IIIA16	939335LU7	$550,000.00	$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
IIIA17	939335LV5	$3,910,000.00	$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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

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
IIIA18	939335LW3	$1,536,261.00	$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
IIIA19	939335LX1	$25,000,000.00	$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
IIIA20	939335LY9	$550,000.00	$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
IIIA21	939335LZ6	$500,000.00	$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
IIIA22	939335MA0	$400,000.00	$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
IIIA23	939335MB8	$400,000.00	$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
IIIA24	939335MC6	$400,000.00	$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
IIIA25	939335MD4	$400,000.00	$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
IIIA26	939335ME2	$400,000.00	$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
IIIA27	939335MF9	$400,000.00	$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
IIIA28	939335MG7	$5,000,000.00	$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
IIIA29	939335MH5	$407,407.00	$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
IIIA30	939335MJ1	$2,657,000.00	$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
IIIA31	939335MK8	$4,449,000.00	$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
IIIA32	939335ML6	$510,000.00	$319,358.53	6.7500000000%	6.7500000000%	$1,796.39	$69,951.76	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$71,748.15	$249,406.77
AX	939335MM4	$11,360,932.00	$560,381.84	6.7500000000%	6.7499999598%	$3,152.15	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,152.15	$496,916.81
IIX	939335MN2	$1,907,006.00	$209,330.61	6.5000000000%	6.5000000000%	$1,133.87	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,133.87	$165,349.44
AP	939335MP7	$1,573,054.00	$259,147.29	0.0000000000%	0.0000000000%	$0.00	$13,681.38	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$13,681.38	$245,465.91
IIP	939335MQ5	$896,483.00	$227,579.97	0.0000000000%	0.0000000000%	$0.00	$7,376.89	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$7,376.89	$220,203.08
CB1	939335MR3	$16,986,305.00	$16,251,072.70	6.7115357017%	6.7115357017%	$90,891.38	$129,788.71	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$220,680.09	$16,121,283.99
CB2	939335MS1	$4,853,231.00	$4,643,164.55	6.7115357017%	6.7115357017%	$25,968.97	$37,082.50	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$63,051.47	$4,606,082.05
CB3	939335MT9	$3,882,583.00	$3,714,529.94	6.7115357017%	6.7115357017%	$20,775.17	$29,665.98	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$50,441.15	$3,684,863.96
CB4	939335NK7	$2,426,615.00	$2,321,581.84	6.7115357017%	6.7115357017%	$12,984.48	$18,541.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$31,525.73	$2,303,040.59
CB5	939335NM3	$1,455,970.00	$1,392,950.03	6.7115357017%	6.7115357017%	$7,790.69	$11,124.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$18,915.45	$1,381,825.28
CB6	939335NP6	$1,941,293.00	$1,629,365.75	6.7115357017%	6.7115357017%	$9,112.96	$13,012.95	$0.00	$0.00	$0.00	$0.00	$0.00	$0.07	$0.00	$22,125.91	$1,616,352.87
R1	939335MU6	$50.00	$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
R2	939335MV4	$50.00	$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
R3	939335MW2	$50.00	$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
MBIA	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
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
IIIA19_ROUND	XXXXXXXXX	$25,000,000.00	$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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

Series: WMMSC.018

Distribution Date: 10/27/2003

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

Total

$970,646,141.00

$84,623,293.93

$474,305.73

$11,103,973.14

$0.00

$0.07

$0.00

$11,578,278.87

$73,519,320.86

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$80,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA2	$34,786,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA3	$7,590,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA4	$22,587,171.00	$8,685,026.54	$0.00	$0.00	$0.00	$0.00	$1,789,103.18	0.3053026588	$6,895,923.36
IA5	$3,750,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA6	$3,490,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA7	$4,533,000.00	$0.13	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000287	$0.13
IA8	$717,149.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA9	$70,000,000.00	$0.02	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000003	$0.02
IA10	$2,592,592.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA11	$176,000.00	$67,674.02	$0.00	$0.00	$0.00	$0.00	$13,940.75	0.3053026705	$53,733.27
IIA1	$49,602,806.00	$3,619,721.10	$0.00	$0.00	$0.00	$0.00	$492,807.84	0.0630390398	$3,126,913.26
IIA2	$100,000,000.00	$7,297,411.97	$0.00	$0.00	$0.00	$0.00	$993,507.99	0.0630390398	$6,303,903.98
IIA3	$920,000.00	$67,136.19	$0.00	$0.00	$0.00	$0.00	$9,140.27	0.0630390435	$57,995.92
IIIA1	$354,937,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA2	$31,650,000.00	$0.02	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000006	$0.02
IIIA3	$15,329,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA4	$54,500,070.00	$34,127,573.34	$0.00	$0.00	$0.00	$0.00	$7,475,246.92	0.4890328842	$26,652,326.42
IIIA5	$50,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA6	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA7	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA8	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA9	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA10	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA11	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA12	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA13	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA14	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA15	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA16	$550,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA17	$3,910,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IIIA18	$1,536,261.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA19	$25,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA20	$550,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA21	$500,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA22	$400,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA23	$400,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA24	$400,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA25	$400,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA26	$400,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA27	$400,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA28	$5,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA29	$407,407.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA30	$2,657,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA31	$4,449,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA32	$510,000.00	$319,358.53	$0.00	$0.00	$0.00	$0.00	$69,951.76	0.4890328824	$249,406.77
AX	$11,360,932.00	$560,381.84	$0.00	$0.00	$0.00	$0.00	$0.00	0.0437390885	$496,916.81
IIX	$1,907,006.00	$209,330.61	$0.00	$0.00	$0.00	$0.00	$0.00	0.0867063030	$165,349.44
AP	$1,573,054.00	$259,147.29	$0.00	$0.00	$0.00	$0.00	$13,681.38	0.1560441727	$245,465.91
IIP	$896,483.00	$227,579.97	$0.00	$0.00	$0.00	$0.00	$7,376.89	0.2456299562	$220,203.08
CB1	$16,986,305.00	$16,251,072.70	$0.00	$0.00	$0.00	$0.00	$129,788.71	0.9490753869	$16,121,283.99
CB2	$4,853,231.00	$4,643,164.55	$0.00	$0.00	$0.00	$0.00	$37,082.50	0.9490753789	$4,606,082.05
CB3	$3,882,583.00	$3,714,529.94	$0.00	$0.00	$0.00	$0.00	$29,665.98	0.9490753862	$3,684,863.96
CB4	$2,426,615.00	$2,321,581.84	$0.00	$0.00	$0.00	$0.00	$18,541.25	0.9490753951	$2,303,040.59
CB5	$1,455,970.00	$1,392,950.03	$0.00	$0.00	$0.00	$0.00	$11,124.75	0.9490753793	$1,381,825.28
CB6	$1,941,293.00	$1,629,365.75	$0.00	$0.07	$0.00	$0.00	$13,012.95	0.8326166478	$1,616,352.87
R1	$50.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R2	$50.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R3	$50.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
MBIA	$0.00	$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
IIIA19_ROUND	$25,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
Total	$970,646,141.00	$84,623,293.93	$0.00	$0.07	$0.00	$0.00	$11,103,973.14	0.0757426602	$73,519,320.86

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003
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	$80,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA2	$34,786,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA3	$7,590,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA4	$22,587,171.00	384.51147955	0.00000000	0.00000000	0.00000000	0.00000000	79.20882079	0.3053026588	305.30265875
IA5	$3,750,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA6	$3,490,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA7	$4,533,000.00	0.00002868	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000287	0.00002868
IA8	$717,149.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA9	$70,000,000.00	0.00000029	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000003	0.00000029
IA10	$2,592,592.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA11	$176,000.00	384.51147727	0.00000000	0.00000000	0.00000000	0.00000000	79.20880682	0.3053026705	305.30267045
IIA1	$49,602,806.00	72.97411965	0.00000000	0.00000000	0.00000000	0.00000000	9.93507988	0.0630390398	63.03903977
IIA2	$100,000,000.00	72.97411970	0.00000000	0.00000000	0.00000000	0.00000000	9.93507990	0.0630390398	63.03903980
IIA3	$920,000.00	72.97411957	0.00000000	0.00000000	0.00000000	0.00000000	9.93507609	0.0630390435	63.03904348
IIIA1	$354,937,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA2	$31,650,000.00	0.00000063	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000006	0.00000063
IIIA3	$15,329,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA4	$54,500,070.00	626.19320195	0.00000000	0.00000000	0.00000000	0.00000000	137.16031778	0.4890328842	489.03288418
IIIA5	$50,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA6	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA7	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA8	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA9	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA10	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA11	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA12	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA13	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA14	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA15	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA16	$550,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA17	$3,910,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IIIA18	$1,536,261.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA19	$25,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA20	$550,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA21	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA22	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA23	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA24	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA25	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA26	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA27	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA28	$5,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA29	$407,407.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA30	$2,657,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA31	$4,449,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA32	$510,000.00	626.19319608	0.00000000	0.00000000	0.00000000	0.00000000	137.16031373	0.4890328824	489.03288235
AX	$11,360,932.00	49.32534056	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0437390885	43.73908848
IIX	$1,907,006.00	109.76924561	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0867063030	86.70630297
AP	$1,573,054.00	164.74150919	0.00000000	0.00000000	0.00000000	0.00000000	8.69733652	0.1560441727	156.04417267
IIP	$896,483.00	253.85865655	0.00000000	0.00000000	0.00000000	0.00000000	8.22870038	0.2456299562	245.62995617
CB1	$16,986,305.00	956.71617223	0.00000000	0.00000000	0.00000000	0.00000000	7.64078533	0.9490753869	949.07538691
CB2	$4,853,231.00	956.71616496	0.00000000	0.00000000	0.00000000	0.00000000	7.64078611	0.9490753789	949.07537886
CB3	$3,882,583.00	956.71617065	0.00000000	0.00000000	0.00000000	0.00000000	7.64078450	0.9490753862	949.07538615
CB4	$2,426,615.00	956.71618283	0.00000000	0.00000000	0.00000000	0.00000000	7.64078768	0.9490753951	949.07539515
CB5	$1,455,970.00	956.71616173	0.00000000	0.00000000	0.00000000	0.00000000	7.64078243	0.9490753793	949.07537930
CB6	$1,941,293.00	839.31985022	0.00000000	0.00003606	0.00000000	0.00000000	6.70323851	0.8326166478	832.61664777
R1	$50.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R2	$50.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R3	$50.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
MBIA	$0.00	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
IIIA19_ROUND	$25,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

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	$80,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA2	$34,786,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA3	$7,590,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA4	$22,587,171.00	6.7500000000%	6.7500000000%	$8,685,026.54	$48,853.27	$0.00	$0.00	$0.00	$48,853.27
IA5	$3,750,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA6	$3,490,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA7	$4,533,000.00	7.0000000000%	7.0000000000%	$0.13	$0.00	$0.00	$0.00	$0.00	$0.00
IA8	$717,149.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA9	$70,000,000.00	6.5000000000%	6.5000000000%	$0.02	$0.00	$0.00	$0.00	$0.00	$0.00
IA10	$2,592,592.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA11	$176,000.00	6.7500000000%	6.7500000000%	$67,674.02	$380.67	$0.00	$0.00	$0.00	$380.67
IIA1	$49,602,806.00	6.5000000000%	6.5000000000%	$3,619,721.10	$19,606.82	$0.00	$0.00	$0.00	$19,606.82
IIA2	$100,000,000.00	6.5000000000%	6.5000000000%	$7,297,411.97	$39,527.65	$0.00	$0.00	$0.00	$39,527.65
IIA3	$920,000.00	6.5000000000%	6.5000000000%	$67,136.19	$363.65	$0.00	$0.00	$0.00	$363.65
IIIA1	$354,937,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA2	$31,650,000.00	6.7500000000%	6.7500000000%	$0.02	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA3	$15,329,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA4	$54,500,070.00	6.7500000000%	6.7500000000%	$34,127,573.34	$191,967.60	$0.00	$0.00	$0.00	$191,967.60
IIIA5	$50,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA6	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA7	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA8	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA9	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA10	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA11	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA12	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA13	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA14	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA15	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA16	$550,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA17	$3,910,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

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
IIIA18	$1,536,261.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA19	$25,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA20	$550,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA21	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA22	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA23	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA24	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA25	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA26	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA27	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA28	$5,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA29	$407,407.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA30	$2,657,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA31	$4,449,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA32	$510,000.00	6.7500000000%	6.7500000000%	$319,358.53	$1,796.39	$0.00	$0.00	$0.00	$1,796.39
AX	$11,360,932.00	6.7500000000%	6.7499999598%	$560,381.84	$3,152.15	$0.00	$0.00	$0.00	$3,152.15
IIX	$1,907,006.00	6.5000000000%	6.5000000000%	$209,330.61	$1,133.87	$0.00	$0.00	$0.00	$1,133.87
AP	$1,573,054.00	0.0000000000%	0.0000000000%	$259,147.29	$0.00	$0.00	$0.00	$0.00	$0.00
IIP	$896,483.00	0.0000000000%	0.0000000000%	$227,579.97	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$16,986,305.00	6.7115357017%	6.7115357017%	$16,251,072.70	$90,891.38	$0.00	$0.00	$0.00	$90,891.38
CB2	$4,853,231.00	6.7115357017%	6.7115357017%	$4,643,164.55	$25,968.97	$0.00	$0.00	$0.00	$25,968.97
CB3	$3,882,583.00	6.7115357017%	6.7115357017%	$3,714,529.94	$20,775.17	$0.00	$0.00	$0.00	$20,775.17
CB4	$2,426,615.00	6.7115357017%	6.7115357017%	$2,321,581.84	$12,984.48	$0.00	$0.00	$0.00	$12,984.48
CB5	$1,455,970.00	6.7115357017%	6.7115357017%	$1,392,950.03	$7,790.69	$0.00	$0.00	$0.00	$7,790.69
CB6	$1,941,293.00	6.7115357017%	6.7115357017%	$1,629,365.75	$9,112.96	$0.00	$0.00	$0.00	$9,112.96
R1	$50.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R2	$50.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R3	$50.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
MBIA	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA19_ROUND	$25,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

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
Total	$970,646,141.00			$84,623,293.93	$474,305.73	$0.00	$0.00	$0.00	$474,305.73

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003
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	$80,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA2	$34,786,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA3	$7,590,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA4	$22,587,171.00	6.7500000000%	6.7500000000%	384.51147955	2.16287688	0.00000000	0.00000000	0.00000000	2.16287688
IA5	$3,750,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA6	$3,490,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA7	$4,533,000.00	7.0000000000%	7.0000000000%	0.00002868	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA8	$717,149.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA9	$70,000,000.00	6.5000000000%	6.5000000000%	0.00000029	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA10	$2,592,592.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA11	$176,000.00	6.7500000000%	6.7500000000%	384.51147727	2.16289773	0.00000000	0.00000000	0.00000000	2.16289773
IIA1	$49,602,806.00	6.5000000000%	6.5000000000%	72.97411965	0.39527643	0.00000000	0.00000000	0.00000000	0.39527643
IIA2	$100,000,000.00	6.5000000000%	6.5000000000%	72.97411970	0.39527650	0.00000000	0.00000000	0.00000000	0.39527650
IIA3	$920,000.00	6.5000000000%	6.5000000000%	72.97411957	0.39527174	0.00000000	0.00000000	0.00000000	0.39527174
IIIA1	$354,937,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA2	$31,650,000.00	6.7500000000%	6.7500000000%	0.00000063	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA3	$15,329,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA4	$54,500,070.00	6.7500000000%	6.7500000000%	626.19320195	3.52233676	0.00000000	0.00000000	0.00000000	3.52233676
IIIA5	$50,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA6	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA7	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA8	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA9	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA10	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA11	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA12	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA13	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA14	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA15	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA16	$550,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA17	$3,910,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003
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
IIIA18	$1,536,261.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA19	$25,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA20	$550,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA21	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA22	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA23	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA24	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA25	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA26	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA27	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA28	$5,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA29	$407,407.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA30	$2,657,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA31	$4,449,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA32	$510,000.00	6.7500000000%	6.7500000000%	626.19319608	3.52233333	0.00000000	0.00000000	0.00000000	3.52233333
AX	$11,360,932.00	6.7500000000%	6.7499999598%	49.32534056	0.27745523	0.00000000	0.00000000	0.00000000	0.27745523
IIX	$1,907,006.00	6.5000000000%	6.5000000000%	109.76924561	0.59458124	0.00000000	0.00000000	0.00000000	0.59458124
AP	$1,573,054.00	0.0000000000%	0.0000000000%	164.74150919	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIP	$896,483.00	0.0000000000%	0.0000000000%	253.85865655	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$16,986,305.00	6.7115357017%	6.7115357017%	956.71617223	5.35086236	0.00000000	0.00000000	0.00000000	5.35086236
CB2	$4,853,231.00	6.7115357017%	6.7115357017%	956.71616496	5.35086214	0.00000000	0.00000000	0.00000000	5.35086214
CB3	$3,882,583.00	6.7115357017%	6.7115357017%	956.71617065	5.35086307	0.00000000	0.00000000	0.00000000	5.35086307
CB4	$2,426,615.00	6.7115357017%	6.7115357017%	956.71618283	5.35086118	0.00000000	0.00000000	0.00000000	5.35086118
CB5	$1,455,970.00	6.7115357017%	6.7115357017%	956.71616173	5.35085888	0.00000000	0.00000000	0.00000000	5.35085888
CB6	$1,941,293.00	6.7115357017%	6.7115357017%	839.31985022	4.69427335	0.00000000	0.00000000	0.00000000	4.69427335
R1	$50.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R2	$50.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R3	$50.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
MBIA	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA19_ROUND	$25,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003
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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018
WEIGHTED AVERAGE PC RATE: 6.72589%
WEIGHTED AVERAGE MATURITY: 290.95151
WEIGHTED AVERAGE LOAN AGE: 29.32169
POOL NUMBER: Group 1(1750,1751,1752)
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $970,646,141.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	216		$84,623,293.94
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$793,840.14
Unscheduled Principal Collection/Reversals		$33,348.58
Liquidations-in-full	28	$10,276,784.35
Subsequent Recoveries		$0.00
Net principal Distributed		$11,103,973.07	-$11,103,973.07

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	188		$73,519,320.87

SCHEDULED INTEREST AT MORTGAGE RATE:		$513,645.49

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
10/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$39,339.69

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:		$11,578,278.87

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018
WEIGHTED AVERAGE PC RATE: 6.82227%
WEIGHTED AVERAGE MATURITY: 321.20704
WEIGHTED AVERAGE LOAN AGE: 30.09016
POOL NUMBER: 1750
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $235,379,218.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	40		$15,844,895.81
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$15,684.81
Unscheduled Principal Collection/Reversals		$232.47
Liquidations-in-full	4	$1,794,154.79
Subsequent Recoveries		$0.00
Net principal Distributed		$1,810,072.07	-$1,810,072.07

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	36		$14,034,823.74

SCHEDULED INTEREST AT MORTGAGE RATE:		$99,726.14

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
10/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$9,644.28

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:		$1,900,153.93

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018
WEIGHTED AVERAGE PC RATE: 6.49250%
WEIGHTED AVERAGE MATURITY: 147.17196
WEIGHTED AVERAGE LOAN AGE: 29.92888
POOL NUMBER: 1751
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $156,505,726.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	41		$15,820,282.17
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$726,470.97
Unscheduled Principal Collection/Reversals		$4,413.53
Liquidations-in-full	4	$986,342.44
Subsequent Recoveries		$0.00
Net principal Distributed		$1,717,226.94	-$1,717,226.94

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	37		$14,103,055.23

SCHEDULED INTEREST AT MORTGAGE RATE:		$92,482.17

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
10/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$6,887.82

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:		$1,802,821.29

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018
WEIGHTED AVERAGE PC RATE: 6.76677%
WEIGHTED AVERAGE MATURITY: 326.27652
WEIGHTED AVERAGE LOAN AGE: 28.89534
POOL NUMBER: 1752
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $578,761,197.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	135		$52,958,115.96
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$51,684.36
Unscheduled Principal Collection/Reversals		$28,702.58
Liquidations-in-full	20	$7,496,287.12
Subsequent Recoveries		$0.00
Net principal Distributed		$7,576,674.06	-$7,576,674.06

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	115		$45,381,441.90

SCHEDULED INTEREST AT MORTGAGE RATE:		$321,437.18

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
10/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$22,807.59

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:		$7,875,303.65

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018
WEIGHTED AVERAGE PC RATE: 6.72589%
WEIGHTED AVERAGE MATURITY: 290.95151
WEIGHTED AVERAGE LOAN AGE: 29.32169
POOL NUMBER: ALL
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $970,646,141.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	216		$84,623,293.94
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$793,840.14
Unscheduled Principal Collection/Reversals		$33,348.58
Liquidations-in-full	28	$10,276,784.35
Subsequent Recoveries		$0.00
Net principal Distributed		$11,103,973.07	-$11,103,973.07

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	188		$73,519,320.87

SCHEDULED INTEREST AT MORTGAGE RATE:		$513,645.49

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
10/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$39,339.69

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:		$11,578,278.87

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(1750,1751,1752)		$11,103,973.07		$474,305.80		$11,578,278.87
Pool - 1750		$1,810,072.07		$90,081.86		$1,900,153.93
Pool - 1751		$1,717,226.94		$85,594.35		$1,802,821.29
Pool - 1752		$7,576,674.06		$298,629.59		$7,875,303.65
Aggregate		$11,103,973.07		$474,305.80		$11,578,278.87

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(1750,1751,1752)	$84,623,293.94	216	28	188	$73,519,320.87	$793,840.14	$10,276,784.35	$33,348.58	$11,103,973.07
Pool - 1750	$15,844,895.81	40	4	36	$14,034,823.74	$15,684.81	$1,794,154.79	$232.47	$1,810,072.07
Pool - 1751	$15,820,282.17	41	4	37	$14,103,055.23	$726,470.97	$986,342.44	$4,413.53	$1,717,226.94
Pool - 1752	$52,958,115.96	135	20	115	$45,381,441.90	$51,684.36	$7,496,287.12	$28,702.58	$7,576,674.06
Aggregate	$84,623,293.94	216	28	188	$73,519,320.87	$793,840.14	$10,276,784.35	$33,348.58	$11,103,973.07

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(1750,1751,1752)	2	$745,216.28	3	$888,418.47	2	$756,063.71	1	$312,625.24
Pool - 1750	0	$0.00	0	$0.00	1	$336,783.73	1	$312,625.24
Pool - 1751	0	$0.00	1	$295,749.59	0	$0.00	0	$0.00
Pool - 1752	2	$745,216.28	2	$592,668.88	1	$419,279.98	0	$0.00
Aggregate	2	$745,216.28	3	$888,418.47	2	$756,063.71	1	$312,625.24

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Group 1(1750,1751,1752)		3		$1,254,696.34		0		$0.00
Pool - 1750		1		$454,810.75		0		$0.00
Pool - 1751		0		$0.00		0		$0.00
Pool - 1752		2		$799,885.59		0		$0.00
Aggregate		3		$1,254,696.34		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(1750,1751,1752)			2			$229,993.40
Aggregate			2			$229,993.40

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

INSURANCE RESERVES - Group 1(1750,1751,1752)
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	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00
Bankruptcy Bond
Single-Units	$263,721.00	$0.00	$0.00	$0.00	$263,721.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00

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	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00
Bankruptcy Bond
Single-Units	$263,721.00	$0.00	$0.00	$0.00	$263,721.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 10/27/2003

The Class Principal Balances of each Class of the Class CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200310 are as follows:

Class			Class Principal Balance
CB1			$16,121,283.99
CB2			$4,606,082.05
CB3			$3,684,863.96
CB4			$2,303,040.59
CB5			$1,381,825.28
CB6			$1,616,352.87
Total			$29,713,448.73
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.

WASHINGTON MUTUAL MOR SEC CORP MOR PASS THRU CERT SER 2001-8 8-K