Structured  Asset Securities Corporation  Mortgage Pass-Through Certificates,  Series
2003-18XS
Distribution Date:     07/25/2003
Record Date:           06/30/2003

Distribution Summary

DISTRIBUTION IN DOLLARS

                                             Prior         Pass-                                                                                     Current
                       Original              Principal     Through       Interest    Principal     Total          Deferred               Realized    Principal
Class                  Balance               Balance       Rate          Distributed Distributed   Distributed    Interest               Loss        Balance
(1)                    (2)                   (3)           (4)           (5)         (6)           (7)=(5+6)      (8)                    (9)         (10)=(3-6+8-9)

A1                     61,268,000.00         59,767,981.64 1.620000%     80,686.78   1,513,024.46  1,593,711.24   0.00                   0.00        58,254,957.18

A2                     45,000,000.00         45,000,000.00 3.730000%     139,875.00  0.00          139,875.00     0.00                   0.00        45,000,000.00

A3                     47,085,000.00         47,085,000.00 3.150000%     123,598.13  0.00          123,598.13     0.00                   0.00        47,085,000.00

A4                     6,010,000.00          6,010,000.00  4.410000%     22,086.75   0.00          22,086.75      0.00                   0.00        6,010,000.00

A5                     21,591,000.00         21,591,000.00 4.910000%     88,343.18   0.00          88,343.18      0.00                   0.00        21,591,000.00

A6                     19,704,000.00         19,704,000.00 4.040000%     66,336.80   0.00          66,336.80      0.00                   0.00        19,704,000.00

A7                     402,000.00            402,000.00    4.040000%     1,353.40    0.00          1,353.40       0.00                   0.00        402,000.00

M1                     5,624,000.00          5,624,000.00  4.870000%     22,824.07   0.00          22,824.07      0.00                   0.00        5,624,000.00

M2                     3,395,000.00          3,395,000.00  5.070000%     14,343.88   0.00          14,343.88      0.00                   0.00        3,395,000.00

M3                     2,121,000.00          2,121,000.00  6.150000%     10,870.13   0.00          10,870.13      0.00                   0.00        2,121,000.00

P                      100.00                100.00        0.000000%     15,460.65   0.00          15,460.65      0.00                   0.00        100.00

X                      661.10                661.10        0.000000%     353,394.43  661.10        354,055.53     0.00                   0.00        0.00

R                      0.00                  0.00          0.000000%     0.00        0.00          0.00           0.00                   0.00        0.00

Totals                 212,200,761.10        210,700,742.74              939,173.20  1,513,685.56  2,452,858.76   0.00                   0.00        203,670,957.18

Notional Classes

AIO                    74,270,266.39         74,270,266.39 5.000000%     309,459.44  0.00          309,459.44     0.00                   0.00        74,270,266.39

Distribution Summary (Factors)

PER $1,000 OF ORIGINAL BALANCE

                                             Prior                                                                                       Current
                                             Principal     Interest      Principal   Total         Deferred       Realized               Principal
                                                           Distributed
Class                  CUSIP                 Balance       (5/2 x 1000)  Distributed Distributed   Interest       Loss                   Balance
                                             (3/2 x 1000)                (6/2 x 1000)(7/2 x 1000)  (8/2 x 1000)   (9/2 x 1000)           (10/2 x
                                                                                                                                         1000)

A1                     86359AWF6             975.517099    1.316948      24.695183   26.012131     0.000000       0.000000               950.821916

A2                     86359AWG4             1,000.000000  3.108333      0.000000    3.108333      0.000000       0.000000               1,000.000000

A3                     86359AWH2             1,000.000000  2.625000      0.000000    2.625000      0.000000       0.000000               1,000.000000

A4                     86359AWJ8             1,000.000000  3.675000      0.000000    3.675000      0.000000       0.000000               1,000.000000

A5                     86359AWK5             1,000.000000  4.091667      0.000000    4.091667      0.000000       0.000000               1,000.000000

A6                     86359AWL3             1,000.000000  3.366667      0.000000    3.366667      0.000000       0.000000               1,000.000000

A7                     86359AYB3             1,000.000000  3.366667      0.000000    3.366667      0.000000       0.000000               1,000.000000

M1                     86359AWN9             1,000.000000  4.058334      0.000000    4.058334      0.000000       0.000000               1,000.000000

M2                     86359AWP4             1,000.000000  4.225001      0.000000    4.225001      0.000000       0.000000               1,000.000000

M3                     86359AWQ2             1,000.000000  5.125002      0.000000    5.125002      0.000000       0.000000               1,000.000000

P                                            1,000.000000  154,606.5000000.000000    154,606.5000000.000000       0.000000               1,000.000000

X                                            1,000.000000  534,555.1807591,000.000000535,555.1807590.000000       0.000000               0.000000

AIO                    86359AWM1             1,000.000000  4.166667      0.000000    4.166667      0.000000       0.000000               1,000.000000

Interest Distribution
Detail

DISTRIBUTION IN DOLLARS

                       Prior                 Pass-         Optimal       Prior       Non-Recov                                                       Current
                       Principal             Through       Accrued       Unpaid      Interest      Interest       Deferred               Interest    Unpaid
                                                                                                                                         Distributed
Class                  Balance               Rate          Interest      Interest    Shortfall     Due            Interest               (9)         Interest
(1)                    (2)                   (3)           (4)           (5)         (6)           (7)=(4)+(5)-(6)(8)                                (10)=(7)-(8)-(9)

A1                     59,767,981.64         1.620000%     80,686.78     0.00        0.00          80,686.78      0.00                   80,686.78   0.00

A2                     45,000,000.00         3.730000%     139,875.00    0.00        0.00          139,875.00     0.00                   139,875.00  0.00

A3                     47,085,000.00         3.150000%     123,598.13    0.00        0.00          123,598.13     0.00                   123,598.13  0.00

A4                     6,010,000.00          4.410000%     22,086.75     0.00        0.00          22,086.75      0.00                   22,086.75   0.00

A5                     21,591,000.00         4.910000%     88,343.18     0.00        0.00          88,343.18      0.00                   88,343.18   0.00

A6                     19,704,000.00         4.040000%     66,336.80     0.00        0.00          66,336.80      0.00                   66,336.80   0.00

A7                     402,000.00            4.040000%     1,353.40      0.00        0.00          1,353.40       0.00                   1,353.40    0.00

M1                     5,624,000.00          4.870000%     22,824.07     0.00        0.00          22,824.07      0.00                   22,824.07   0.00

M2                     3,395,000.00          5.070000%     14,343.88     0.00        0.00          14,343.88      0.00                   14,343.88   0.00

M3                     2,121,000.00          6.150000%     10,870.13     0.00        0.00          10,870.13      0.00                   10,870.13   0.00

P                      100.00                0.000000%     15,460.65     0.00        0.00          15,460.65      0.00                   15,460.65   0.00

X                      661.10                0.000000%     353,394.43    0.00        0.00          353,394.43     0.00                   353,394.43  0.00

R                      0.00                  0.000000%     0.00          0.00        0.00          0.00           0.00                   0.00        0.00

  Totals               210,700,742.74                      939,173.20    0.00        0.00          939,173.20     0.00                   939,173.20  0.00

Notional Classes

AIO                    74,270,266.39         5.000000%     309,459.44    0.00        0.00          309,459.44     0.00                   309,459.44  0.00

Principal Distribution
Detail

DISTRIBUTION IN DOLLARS

                                             Prior                                   Current       Current        Current                Cumulative
                       Original              Principal     Principal     Accreted    Realized      Principal      Principal              Realized
Class                  Balance               Balance       Distribution  Principal   Losses        Recoveries     Balance                Losses
(1)                    (2)                   (3)           (4)           (5)         (6)           (7)            (8)=(3)-(4)+(5)-(6)+(7)(9)

A1                     61,268,000.00         59,767,981.64 1,513,024.46  0.00        0.00          0.00           58,254,957.18          0.00

A2                     45,000,000.00         45,000,000.00 0.00          0.00        0.00          0.00           45,000,000.00          0.00

A3                     47,085,000.00         47,085,000.00 0.00          0.00        0.00          0.00           47,085,000.00          0.00

A4                     6,010,000.00          6,010,000.00  0.00          0.00        0.00          0.00           6,010,000.00           0.00

A5                     21,591,000.00         21,591,000.00 0.00          0.00        0.00          0.00           21,591,000.00          0.00

A6                     19,704,000.00         19,704,000.00 0.00          0.00        0.00          0.00           19,704,000.00          0.00

A7                     402,000.00            402,000.00    0.00          0.00        0.00          0.00           402,000.00             0.00

M1                     5,624,000.00          5,624,000.00  0.00          0.00        0.00          0.00           5,624,000.00           0.00

M2                     3,395,000.00          3,395,000.00  0.00          0.00        0.00          0.00           3,395,000.00           0.00

M3                     2,121,000.00          2,121,000.00  0.00          0.00        0.00          0.00           2,121,000.00           0.00

P                      100.00                100.00        0.00          0.00        0.00          0.00           100.00                 0.00

X                      661.10                661.10        661.10        0.00        0.00          0.00           0.00                   0.00

R                      0.00                  0.00          0.00          0.00        0.00          0.00           0.00                   0.00

  Totals               210,079,000.00        210,700,742.741,513,685.56  559,447.99  1,513,024.46  0.00           209,187,057.18         0.00

Collateral Summary

ASSET CHARACTERISTICS

                       Cut-Off               Prior         Current

Aggregate Stated
Principal Balance      212,200,761.10        210,700,742.74209,187,718.28

Loan Count             970                   963           956

Weighted Average Coupon
Rate (WAC)             7.283868%             7.284200%     N/A

Net Weighted Average
Coupon Rate (Net WAC)  7.033868%             7.034200%     N/A

Weighted Average
Maturity (WAM in       326                   325           325
months)

AVAILABLE PRINCIPAL    AVAILABLE INTEREST

Scheduled Interest     1,278,988.70
Curtailments           32,815.25
Less:                  Servicing Fees        43,896.14
Class A5 Insurance
Premium                1,259.48
Uncompensated PPIS     0.00
Relief Act Shortfall   0.00
Other Interest
Reductions             0.00
TOTAL AVAILABLE
PRINCIPAL              75,629.00
TOTAL AVAILABLE
INTEREST               1,233,833.09
Current Realized Losses0.00
Cumulative Realized
Losses                 0.00

Delinquency Information

Less Than
30 Days                30-59 Days            60-89 Days    90+ Days      Totals

Delinquency

Scheduled Principal
Balance                1,237,680.85          245,275.26    0.00          1,482,956.11
Percentage of Total
Pool Balance           0.5917%               0.1173%       0.0000%       0.7089%
Number of Loans        6                     1             0             7

Percentage of Total
Loans                  0.6276%               0.1046%       0.0000%       0.7322%
Bankruptcy

Scheduled Principal
Balance                51,198.65             0.00          0.00          0.00        51,198.65
Percentage of Total
Pool Balance           0.0245%               0.0000%       0.0000%       0.0000%     0.0245%

Number of Loans        1                     0             0             0           1
Percentage of Total
Loans                  0.1046%               0.0000%       0.0000%       0.0000%     0.1046%

Foreclosure

Scheduled Principal
Balance                                      0.00          0.00          0.00        0.00
Percentage of Total Pool Balance             0.0000%       0.0000%       0.0000%     0.0000%

Number of Loans                              0             0             0           0
Percentage of Total
Loans                                        0.0000%       0.0000%       0.0000%     0.0000%

REO

Scheduled Principal
Balance                                      0.00          0.00          0.00        0.00
Percentage of Total Pool Balance             0.0000%       0.0000%       0.0000%     0.0000%

Number of Loans                              0             0             0           0
Percentage of Total
Loans                                        0.0000%       0.0000%       0.0000%     0.0000%

Total

Scheduled Principal
Balance                51,198.65             1,237,680.85  245,275.26    0.00        1,534,154.76
Percentage of Total
Pool Balance           0.0245%               0.5917%       0.1173%       0.0000%     0.7334%

Number of Loans        1                     6             1             0           8
Percentage of Total
Loans                  0.1046%               0.6276%       0.1046%       0.0000%     0.8368%

Principal and Interest
Advances               1,034,221.97

Other Information

Any Certificates
reflect the applicationNo
of the Net Funds Cap?

Net Funds Cap          5.264568%

Aggregate
Overcollateralization  0.00
Release Amount

CONTACT INFORMATION    CONTENTS

Distribution Summary   2
Depositor              Structured Asset
                       Securities Corporation
Distribution Summary
(Factors)              2

New York, NY  10019
Interest Distribution  2
Underwriter            Lehman Brothers
745 Seventh Avenue, 7th
Floor
Principal Distribution 2
New York, NY  10019

Collateral Summary     2
2530 South Parker Road, Suite 601

Delinquency Information2

Trustee                Citibank, N.A.
Other Information      2

New York, NY  10005

Deal Contact:          Karen Schluter        Citibank, N.A.
karen.schluter@citi.com                      Agency and
                                             Trust
                                             111 Wall
Tel: (212) 657-7781                          Street, 14th
                                             Floor, Zone 3
Fax: (212) 657-4009                          New York, NY
                                             10005

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                       www.sf.citidirect.com 2003 Citigroup

STRUCTURED ASSET SECURITIES CORP SERIES 2003-23H 8-K