Cross-site scripting (XSS) vulnerability in Joomla! before 1.5.12 allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO.
http://www.securityfocus.com/bid/35544
http://www.openwall.com/lists/oss-security/2011/12/25/8
http://www.openwall.com/lists/oss-security/2011/12/25/3