UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  FORM 10-K


  (Mark one)

  /X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the fiscal year ended December 31, 2007

      OR


  / / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the transition period from ____________ to ____________



      Commission file number: 333-135481-13

      CSMC Mortgage-Backed Trust 2007-1
      (exact name of issuing entity as specified in its charter)

      Credit Suisse First Boston Mortgage Securities Corp.
      (exact name of the depositor as specified in its charter)

      DLJ Mortgage Capital, Inc.
      (exact name of the sponsor as specified in its charter)



  New York                                54-2198763
  (State or other jurisdiction of         54-2198764
  incorporation or organization)          54-2198765
                                          54-2198766
                                          54-2198767
                                          54-6731733
                                          (I.R.S. Employer
                                          Identification No.)


   c/o Wells Fargo Bank, N.A.
   9062 Old Annapolis Rd.
   Columbia, MD                                 21045
  (Address of principal executive               (Zip Code)
  offices)


 Telephone number, including area code: (410) 884-2000




  Securities registered pursuant to Section 12(b) of the Act:

    NONE.



  Securities registered pursuant to Section 12(g) of the Act:

    NONE.



  Indicate by check mark if the registrant is a well-known seasoned issuer, as
  defined in Rule 405 of the Securities Act.

    Yes ___     No  X



  Indicate by check mark if the registrant is not required to file reports
  pursuant to Section 13 or Section 15(d) of the Act.

    Yes ___     No  X



  Note - Checking the box above will not relieve any registrant required to
  file reports pursuant to Section 13 or 15(d) of the Exchange Act from their
  obligations under those Sections.


  Indicate by check mark whether the registrant (1) has filed all reports
  required to be filed by Section 13 or 15(d) of the Securities Exchange Act
  of 1934 during the preceding 12 months (or for such shorter period that the
  registrant was required to file such reports), and (2) has been subject to
  such filing requirements for the past 90 days.

    Yes  X      No ___



  Indicate by check mark if disclosure of delinquent filers pursuant to Item
  405 of Regulation S-K (Section 229.405 of this chapter) is not contained
  herein, and will not be contained, to the best of registrant's knowledge, in
  definitive proxy or information statements incorporated by reference in Part
  III of this Form 10-K or any amendment to this Form 10-K.

   X

  Indicate by check mark whether the registrant is a large accelerated filer,
  an accelerated filer, a non-accelerated filer, or a smaller reporting
  company.  See the definitions of "large accelerated filer", "accelerated
  filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

   Large accelerated filer ___
   Accelerated filer ___
   Non-accelerated filer X (Do not check if a smaller reporting company)
   Smaller reporting company ___

  Indicate by check mark whether the registrant is a shell company (as defined
  in Rule 12b-2 of the Act).

    Yes ___     No  X



  State the aggregate market value of the voting and non-voting common equity
  held by non-affiliates computed by reference to the price at which the
  common equity was last sold, or the average bid and asked price of such
  common equity, as of the last business day of the registrant's most recently
  completed second fiscal quarter.

    Not applicable.



  Indicate by check mark whether the registrant has filed all documents and
  reports required to be filed by Section 12, 13 or 15(d) of the Securities
  Exchange Act of 1934 subsequent to the distribution of securities under a
  plan confirmed by a court.

    Not applicable.



  Indicate the number of shares outstanding of each of the registrant's
  classes of common stock, as of the latest practicable date.

    Not applicable.



  DOCUMENTS INCORPORATED BY REFERENCE

  List hereunder the following documents if incorporated by reference and the
  Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document
  is incorporated: (1)Any annual report to security holders; (2) Any proxy or
  information statement; and (3)Any prospectus filed pursuant to Rule 424(b)
  or (c) under the Securities Act of 1933. The listed documents should be
  clearly described for identification purposes (e.g., annual report to
  security holders for fiscal year ended December 24, 1980).

    Not applicable.





                                     PART I

  Item 1.      Business.

               Omitted.


  Item 1A.     Risk Factors.

               Omitted.


  Item 1B.     Unresolved Staff Comments.

               None.


  Item 2.      Properties.

               Omitted.


  Item 3.      Legal Proceedings.

               Omitted.


  Item 4.      Submission of Matters to a Vote of Security Holders.

               Omitted.




                                     PART II

  Item 5.      Market for Registrant's Common Equity, Related Stockholder
               Matters and Issuer Purchases of Equity Securities.

               Omitted.


  Item 6.      Selected Financial Data.

               Omitted.


  Item 7.      Management's Discussion and Analysis of Financial Condition and
               Results of Operation.

               Omitted.


  Item 7A.     Quantitative and Qualitative Disclosures About Market Risk.

               Omitted.


  Item 8.      Financial Statements and Supplementary Data.

               Omitted.


  Item 9.      Changes in and Disagreements With Accountants on Accounting and
               Financial Disclosure.

               Omitted.


  Item 9A.     Controls and Procedures.

               Omitted.


  Item 9A(T).  Controls and Procedures.

               Omitted.


  Item 9B.     Other Information.

               None.




                                    PART III

  Item 10.     Directors, Executive Officers and Corporate Governance.

               Omitted.


  Item 11.     Executive Compensation.

               Omitted.


  Item 12.     Security Ownership of Certain Beneficial Owners and Management
               and Related Stockholder Matters.

               Omitted.


  Item 13.     Certain Relationships and Related Transactions, and Director
               Independence.

               Omitted.


  Item 14.     Principal Accounting Fees and Services.

               Omitted.




  ADDITIONAL DISCLOSURE ITEMS FOR REGULATION AB


Item 1112(b) of Regulation AB, Significant Obligor Financial Information.

No single obligor represents 10% or more of the pool assets held by the issuing
entity.



Item 1114(b)(2) of Regulation AB, Significant Enhancement  Provider Financial
Information.

No entity or group of affiliated entities provides any external credit
enhancement or other support for the certificates within this transaction as
described under Item 1114 (a) of Regulation AB.



Item 1115(b) of Regulation AB, Certain Derivatives Instruments (Financial
Information).

Credit Suisse International provides an Interest Rate Cap Agreement and a Yield
Maintenance Agreement for the trust as disclosed in the 424 Prospectus.  No
additional disclosure is necessary because the significance percentage for each
of the Interest Rate Cap Agreement and the Yield Maintenance Agreement is less
than 10%.



Item 1117 of Regulation AB, Legal Proceedings.

The registrant knows of no material pending legal proceedings involving the
Trust and all parties related to such Trust, other than routine litigation
incidental to the duties of those respective parties.



Item 1119 of Regulation AB, Affiliations and Certain Relationships and Related
Transactions.

The information regarding this Item has been previously filed in a 424(b)(5)
filing dated January 31, 2007.



Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria.

The reports on assessment of compliance with the servicing criteria for
asset-backed securities and the related attestation reports on such assessments
of compliance are attached hereto under Item 15.

         LaSalle Bank National Association's ("LaSalle") Report on Assessment
of Compliance with Servicing Criteria for 2007 (the "2007 Assessment") attached
to this Report on Form 10-K describes in Appendix B the following material
instance of noncompliance related to investor reporting:

         "1122(d)(3)(i)(A) and (B) - During the Reporting Period, certain
monthly investor or remittance reports were not prepared in accordance with the
terms set forth in the transaction agreements and certain investor reports did
not provide the information calculated in accordance with the terms specified
in the transaction agreements for which certain individual errors may or may
not have been material."

         The investor reporting errors identified on LaSalle's 2007 Assessment
as material instances of noncompliance (the "Investor Reporting Errors")
included, for example, revised delinquency, REO, foreclosure, repurchase,
payoff or modified loan counts, category indicators and/or balances. The
conclusion that the Investor Reporting Errors amounted to a material instance
of noncompliance was based primarily on the aggregate number of errors as
opposed to the materiality of any one error.

         The Investor Reporting Errors were generally caused by human error
resulting primarily from high volume monthly data processing demands that had
to be addressed within constricted time frames with less than a full complement
of operational staff. Between the fourth quarter of the Reporting Period and
the date of the 2007 Assessment, LaSalle has employed additional operational
staff to accommodate the high volume of monthly investor reporting requirements
and minimize the risk of the Investor Reporting Errors recurring. Other
necessary controls are in place to minimize the risk of such errors.

         With respect to the specific pool assets and asset-backed securities
related to the Investor Reporting Errors, the errors did not have, and are not
reasonable likely in the future to have, any material impact or effect on pool
asset performance, servicing of the pool assets and payments or expected
payments on the mortgage-backed securities.



Item 1123 of Regulation AB, Servicer Compliance Statement.

The servicer compliance statements are attached hereto under Item 15.



                               Part IV

  Item 15. Exhibits, Financial Statement Schedules.

  (a) Exhibits.

  (4) THE POOLING AND SERVICING AGREEMENT, dated as of January 1, 2007, by and
  among CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP., a Delaware
  corporation, as depositor (the "Depositor"), DLJ MORTGAGE CAPITAL, INC.
  ("DLJMC"), a Delaware corporation, as seller ("Seller"), WELLS FARGO BANK,
  N.A. ("Wells Fargo"), a national banking association, in its capacity as a
  servicer (a "Servicer"), as master servicer (the "Master Servicer") and as
  trust administrator (the "Trust Administrator"), BANCO POPULAR DE PUERTO
  RICO ("Banco Popular"), as a servicer (a "Servicer"), GREENPOINT MORTGAGE
  FUNDING, INC., a New York corporation ("Greenpoint"), as a seller (in such
  capacity, a "Seller"), and as a servicer (in such a capacity, a "Servicer"),
  Select Portfolio Servicing, Inc. ("SPS"), a Utah corporation, as a servicer
  (in such capacity, a "Servicer") as a special servicer (in such capacity ,
  the "Special Servicer") and as modification oversight agent (in such capacity,
  the "Modification Oversight Agent") and U.S. BANK NATIONAL ASSOCIATION, a
  national banking association, as trustee (the "Trustee"). (incorporated
  herein by reference from Exhibit 4.1 of the Current Report on Form 8-K of the
  issuing entity, as filed with the Securities and Exchange Commission on April
  27, 2007 as File No. 333-135481-13, Film No. 07796988, CIK No. 0001387355).

  (10) Incorporated by reference as Exhibit (4).

  (31) Rule 13a-14(d)/15d-14(d) Certification.

  (33) Reports on assessment of compliance with servicing criteria for
  asset-backed securities.


    <TABLE>
    
      <c>

    33.1 Banco Popular de Puerto Rico as Custodian
    33.2 Countrywide Home Loans Servicing LP as Servicer
    33.3 IndyMac Bank, F.S.B. as Servicer
    33.4 LaSalle Bank, National Association as Custodian
    33.5 Newport Management Corporation as Sub-Contractor for IndyMac Bank, F.S.B.
    33.6 Select Portfolio Servicing, Inc. as Servicer
    33.7 Wells Fargo Bank, N.A. as Servicer
    33.8 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator
    33.9 Wells Fargo Bank, N.A. as Custodian

    </TABLE>


  (34) Attestation reports on assessment of compliance with servicing criteria
  for asset-backed securities.


    <TABLE>
    
      <c>

    34.1 Banco Popular de Puerto Rico as Custodian
    34.2 Countrywide Home Loans Servicing LP as Servicer
    34.3 IndyMac Bank, F.S.B. as Servicer
    34.4 LaSalle Bank, National Association as Custodian
    34.5 Newport Management Corporation as Sub-Contractor for IndyMac Bank, F.S.B.
    34.6 Select Portfolio Servicing, Inc. as Servicer
    34.7 Wells Fargo Bank, N.A. as Servicer
    34.8 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator
    34.9 Wells Fargo Bank, N.A. as Custodian

    </TABLE>


   (35) Servicer compliance statement.


    <TABLE>
    
       <c>

    35.1 IndyMac Bank, F.S.B. as Servicer
    35.2 Select Portfolio Servicing, Inc. as Servicer
    35.3 Wells Fargo Bank, N.A. as Servicer
    35.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator

    </TABLE>


   (b) Not applicable.

   (c) Omitted.



                          SIGNATURES


  Pursuant to the requirements of Section 13 or 15(d) of the Securities
  Exchange Act of 1934, the registrant has duly caused this report to be
  signed on its behalf by the undersigned, thereunto duly authorized.


   Credit Suisse First Boston Mortgage Securities Corp.
   (Depositor)


   /s/ Bruce Kaiserman
   Bruce Kaiserman, Vice President
   (senior officer in charge of securitization of the depositor)


    Date:   March 27, 2008



  Exhibit Index

  Exhibit No.


  (4) THE POOLING AND SERVICING AGREEMENT, dated as of January 1, 2007, by and
  among CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP., a Delaware
  corporation, as depositor (the "Depositor"), DLJ MORTGAGE CAPITAL, INC.
  ("DLJMC"), a Delaware corporation, as seller ("Seller"), WELLS FARGO BANK,
  N.A. ("Wells Fargo"), a national banking association, in its capacity as a
  servicer (a "Servicer"), as master servicer (the "Master Servicer") and as
  trust administrator (the "Trust Administrator"), BANCO POPULAR DE PUERTO
  RICO ("Banco Popular"), as a servicer (a "Servicer"), GREENPOINT MORTGAGE
  FUNDING, INC., a New York corporation ("Greenpoint"), as a seller (in such
  capacity, a "Seller"), and as a servicer (in such a capacity, a "Servicer"),
  Select Portfolio Servicing, Inc. ("SPS"), a Utah corporation, as a servicer
  (in such capacity, a "Servicer") as a special servicer (in such capacity ,
  the "Special Servicer") and as modification oversight agent (in such capacity,
  the "Modification Oversight Agent") and U.S. BANK NATIONAL ASSOCIATION, a
  national banking association, as trustee (the "Trustee"). (incorporated
  herein by reference from Exhibit 4.1 of the Current Report on Form 8-K of the
  issuing entity, as filed with the Securities and Exchange Commission on April
  27, 2007 as File No. 333-135481-13, Film No. 07796988, CIK No. 0001387355).

   (10) Incorporated by reference as Exhibit (4).

   (31) Rule 13a-14(d)/15d-14(d) Certification.

   (33) Reports on assessment of compliance with servicing criteria for
   asset-backed securities.


    <TABLE>

    
      <c>
    33.1 Banco Popular de Puerto Rico as Custodian
    33.2 Countrywide Home Loans Servicing LP as Servicer
    33.3 IndyMac Bank, F.S.B. as Servicer
    33.4 LaSalle Bank, National Association as Custodian
    33.5 Newport Management Corporation as Sub-Contractor for IndyMac Bank, F.S.B.
    33.6 Select Portfolio Servicing, Inc. as Servicer
    33.7 Wells Fargo Bank, N.A. as Servicer
    33.8 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator
    33.9 Wells Fargo Bank, N.A. as Custodian

    </TABLE>

   (34) Attestation reports on assessment of compliance with servicing
   criteria for asset-backed securities.


    <TABLE>

    
      <c>
    34.1 Banco Popular de Puerto Rico as Custodian
    34.2 Countrywide Home Loans Servicing LP as Servicer
    34.3 IndyMac Bank, F.S.B. as Servicer
    34.4 LaSalle Bank, National Association as Custodian
    34.5 Newport Management Corporation as Sub-Contractor for IndyMac Bank, F.S.B.
    34.6 Select Portfolio Servicing, Inc. as Servicer
    34.7 Wells Fargo Bank, N.A. as Servicer
    34.8 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator
    34.9 Wells Fargo Bank, N.A. as Custodian

    </TABLE>

   (35) Servicer compliance statement.


    <TABLE>

    
       <c>
    35.1 IndyMac Bank, F.S.B. as Servicer
    35.2 Select Portfolio Servicing, Inc. as Servicer
    35.3 Wells Fargo Bank, N.A. as Servicer
    35.4 Wells Fargo Bank, N.A. as Master Servicer and Trust Administrator

    </TABLE>