includes/specials/SpecialChangePassword.php in MediaWiki before 1.19.14, 1.20.x and 1.21.x before 1.21.8, and 1.22.x before 1.22.5 does not properly handle a correctly authenticated but unintended login attempt, which makes it easier for remote authenticated users to obtain sensitive information by arranging for a victim to login to the attacker's account, as demonstrated by tracking the victim's activity, related to a "login CSRF" issue.
https://gerrit.wikimedia.org/r/#/c/121517/1/includes/specials/SpecialChangePassword.php
https://bugzilla.wikimedia.org/show_bug.cgi?id=62497
http://openwall.com/lists/oss-security/2014/04/01/7
http://openwall.com/lists/oss-security/2014/03/28/1
http://lists.wikimedia.org/pipermail/mediawiki-announce/2014-March/000145.html