Multiple cross-site scripting (XSS) vulnerabilities in OSClass before 3.4.2 allow remote attackers to inject arbitrary web script or HTML via the (1) action or (2) nsextt parameter to oc-admin/index.php or the (3) nsextt parameter in an items_reported action to oc-admin/index.php.
http://www.securityfocus.com/archive/1/533457/100/0/threaded
http://blog.osclass.org/2014/09/15/osclass-3-4-2-ready-download