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.
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secunia.com/advisories/24211
securityreason.com/securityalert/2274
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exchange.xforce.ibmcloud.com/vulnerabilities/32586
svn.wikimedia.org/svnroot/mediawiki/tags/REL1_9_3/phase3/RELEASE-NOTES