Multiple cross-site scripting (XSS) vulnerabilities in admin.php in Phorum before 5.1.22 allow remote attackers to inject arbitrary web script or HTML via the (1) group_id parameter in the groups module or (2) the smiley_id parameter in the smileys modsettings module.
http://www.securityfocus.com/archive/1/466286/100/0/threaded
http://www.phorum.org/story.php?76