CRLF injection vulnerability in SquirrelMail 1.4.21 and earlier allows remote attackers to modify or add preference values via a \n (newline) character, a different vulnerability than CVE-2010-4555.
https://exchange.xforce.ibmcloud.com/vulnerabilities/68587
http://www.squirrelmail.org/security/issue/2011-07-11
http://www.mandriva.com/security/advisories?name=MDVSA-2011:123