CVE-2012-4531
Cross-site scripting (XSS) vulnerability in Joomla! 2.5.x before 2.5.7 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
Date published : 2012-10-31
http://developer.joomla.org/security/news/539-20120901-core-xss-vulnerability
http://www.joomla.org/announcements/release-news/5463-joomla-2-5-7-released.html