Class B-4 of CSFB Home Equity Asset Trust series 2006-4 has been placed on Rating Watch Negative by Fitch Ratings.In addition, Fitch upgraded one class and affirmed the ratings on 22 classes in four Credit Suisse First Boston mortgage-backed securitizations. The negative rating action was attributed to "early negative trends in the relationship between serious delinquency and credit enhancement." The rating agency can be found online at http://www.fitchratings.com.

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