Multiple cross-site scripting (XSS) vulnerabilities in Claroline before 1.8.6 allow remote authenticated administrators to inject arbitrary web script or HTML via the (1) dir parameter in admin/adminusers.php, the (2) action parameter in admin/advancedUserSearch.php, and the (3) view parameter in admin/campusProblem.php.
http://www.vupen.com/english/advisories/2007/3045
http://www.claroline.net/wiki/index.php/Changelog_1.8.x#Security
http://www.claroline.net/forum/viewtopic.php?t=13448