Cross-site scripting (XSS) vulnerability in the update manager in Joomla! 2.5.x before 2.5.4 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
http://www.securityfocus.com/bid/52859
http://www.openwall.com/lists/oss-security/2012/04/03/5
http://www.openwall.com/lists/oss-security/2012/04/03/3
http://secunia.com/advisories/48683
http://developer.joomla.org/security/news/399-20120308-core-xss-vulnerability.html