Cross-site scripting (XSS) vulnerability in manager/login.php in CruxSoftware CruxCMS 3.0, and possibly earlier, allows remote attackers to inject arbitrary web script or HTML via the txtusername parameter.
http://www.vupen.com/english/advisories/2010/1708
http://www.securityfocus.com/archive/1/512245/100/0/threaded