Cross-site scripting (XSS) vulnerability in the AJAX features in index.php in MediaWiki 1.6.x through 1.9.2, when $wgUseAjax is enabled, allows remote attackers to inject arbitrary web script or HTML via a UTF-7 encoded value of the rs parameter, which is processed by Internet Explorer.
https://exchange.xforce.ibmcloud.com/vulnerabilities/32586
http://www.vupen.com/english/advisories/2007/0678
http://www.securityfocus.com/archive/1/460596/100/0/threaded
http://svn.wikimedia.org/svnroot/mediawiki/tags/REL1_9_3/phase3/RELEASE-NOTES
http://sourceforge.net/project/shownotes.php?release_id=487921&group_id=34373
http://securityreason.com/securityalert/2274