Cross-site scripting (XSS) vulnerability in the outputPage function in includes/SkinTemplate.php in MediaWiki before 1.17.5, 1.18.x before 1.18.4, and 1.19.x before 1.19.1 allows remote attackers to inject arbitrary web script or HTML via the uselang parameter to index.php/Main_page.
https://www.mediawiki.org/wiki/Release_notes/1.19
https://www.mediawiki.org/wiki/Release_notes/1.18
https://www.mediawiki.org/wiki/Release_notes/1.17
https://exchange.xforce.ibmcloud.com/vulnerabilities/76311
https://bugzilla.wikimedia.org/show_bug.cgi?id=36938
http://www.openwall.com/lists/oss-security/2012/06/14/2
http://securitytracker.com/id?1027179
http://secunia.com/advisories/49484
http://lists.wikimedia.org/pipermail/mediawiki-announce/2012-June/000118.html
http://lists.wikimedia.org/pipermail/mediawiki-announce/2012-June/000117.html
http://lists.wikimedia.org/pipermail/mediawiki-announce/2012-June/000116.html