CVE-2011-4361

MediaWiki before 1.17.1 does not check for read permission before handling
action=ajax requests, which allows remote attackers to obtain sensitive
information by (1) leveraging the SpecialUpload::ajaxGetExistsWarning
function, or by (2) leveraging an extension, as demonstrated by the
CategoryTree, ExtTab, and InlineEditor extensions.

Bugs

• <https://bugzilla.wikimedia.org/show_bug.cgi?id=32616&gt;