Cross-site scripting (XSS) vulnerability in login/default.aspx in Sitecore CMS before 6.0.2 Update-1 090507 allows remote attackers to inject arbitrary web script or HTML via the sc_error parameter.
http://www.securityfocus.com/archive/1/504132/100/0/threaded
http://www.securityfocus.com/archive/1/504093/100/0/threaded