CSFB MBS Certificates Downgraded

Five certificates from four deals issued by Credit Suisse First Boston Mortgage Securities Corp. in 2002 have been downgraded by Moody's Investors Service, and two others have been placed under review for possible downgrade.The downgrades were as follows: series 2002-5, class IV-B-5, from Ba3 to Caa1; series 2002-10, class II-B-3, from Baa3 to B1, and class II-B-5, from Ca to C; series 2002-19, class II-M-1, from Ba2 to B1; and series 2002-26, class III-B, from Ba1 to Ba3. The certificates placed under review for possible downgrade are class I-B-3 of series 2002-9 and class II-B-4 of series 2002-10. Moody's also confirmed the rating of one certificate. The negative rating actions were based on the fact that credit enhancement levels were too low for the current rating level in view of projected losses, Moody's said. The rating agency can be found on the Web at http://www.moodys.com.