webmail.php in SquirrelMail 1.4.0 to 1.4.5 allows remote attackers to inject arbitrary web pages into the right frame via a URL in the right_frame parameter. NOTE: this has been called a cross-site scripting (XSS) issue, but it is different than what is normally identified as XSS.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10419
https://exchange.xforce.ibmcloud.com/vulnerabilities/24847
http://www.vupen.com/english/advisories/2006/0689
http://www.squirrelmail.org/security/issue/2006-02-01
http://www.securityfocus.com/bid/16756
http://www.redhat.com/support/errata/RHSA-2006-0283.html
http://www.redhat.com/archives/fedora-announce-list/2006-March/msg00004.html
http://www.novell.com/linux/security/advisories/2006_05_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:049
http://www.gentoo.org/security/en/glsa/glsa-200603-09.xml
http://www.debian.org/security/2006/dsa-988
http://securitytracker.com/id?1015662
http://secunia.com/advisories/20210
http://secunia.com/advisories/19960
http://secunia.com/advisories/19205
http://secunia.com/advisories/19176
http://secunia.com/advisories/19131