Cross-site request forgery (CSRF) vulnerability in api/ApiQueryCheckUser.php in the CheckUser extension for MediaWiki, possibly Checkuser before 2.3, allows remote attackers to hijack the authentication of arbitrary users for requests that “perform sensitive write actions” via unspecified vectors.
lists.wikimedia.org/pipermail/mediawiki-announce/2013-September/000133.html
osvdb.org/96908
seclists.org/oss-sec/2013/q3/553
www.securityfocus.com/bid/62210
bugzilla.wikimedia.org/show_bug.cgi?id=45019
exchange.xforce.ibmcloud.com/vulnerabilities/86893
git.wikimedia.org/commit/mediawiki%2Fextensions%2FCheckUser.git/99ad25d066ce6111e798427cba7f21526827f651