Cross-site scripting (XSS) vulnerability in action.php in Nucleus CMS 3.31 allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO, which is not quoted when processing PHP_SELF.
http://www.vupen.com/english/advisories/2008/0369
http://www.securityfocus.com/bid/27492
http://www.securityfocus.com/archive/1/487255/100/0/threaded
http://www.securityfocus.com/archive/1/487252/100/0/threaded
http://www.nucleuscms.org/item/3047
http://sourceforge.net/project/shownotes.php?group_id=66479&release_id=572117