Multiple cross-site scripting (XSS) vulnerabilities in SquirrelMail 1.4.21 and earlier allow remote attackers to inject arbitrary web script or HTML via vectors involving (1) drop-down selection lists, (2) the > (greater than) character in the SquirrelSpell spellchecking plugin, and (3) errors associated with the Index Order (aka options_order) page.
https://exchange.xforce.ibmcloud.com/vulnerabilities/68511
https://exchange.xforce.ibmcloud.com/vulnerabilities/68510
https://bugzilla.redhat.com/show_bug.cgi?id=720694
http://www.squirrelmail.org/security/issue/2011-07-11
http://www.mandriva.com/security/advisories?name=MDVSA-2011:123
http://www.debian.org/security/2011/dsa-2291
http://support.apple.com/kb/HT5130
http://squirrelmail.svn.sourceforge.net/viewvc/squirrelmail?view=revision&revision=14119
http://rhn.redhat.com/errata/RHSA-2012-0103.html
http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.html