Multiple cross-site request forgery (CSRF) vulnerabilities in MediaWiki 1.17.x before 1.17.3 and 1.18.x before 1.18.2 allow remote attackers to hijack the authentication of users with the block permission for requests that (1) block a user via a request to the Block module or (2) unblock a user via a request to the Unblock module.
lists.wikimedia.org/pipermail/mediawiki-announce/2012-March/000109.html
lists.wikimedia.org/pipermail/mediawiki-announce/2012-March/000110.html
osvdb.org/80361
secunia.com/advisories/48504
www.openwall.com/lists/oss-security/2012/03/22/9
www.openwall.com/lists/oss-security/2012/03/24/1
www.securityfocus.com/bid/52689
bugzilla.wikimedia.org/show_bug.cgi?id=34212
exchange.xforce.ibmcloud.com/vulnerabilities/78911