Cross-site request forgery (CSRF) vulnerability in the Admin Control Panel (ACP) login in MyBB (aka MyBulletinBoard) before 1.8.4 allows remote attackers to hijack the authentication of unspecified victims via unknown vectors.
http://www.securitytracker.com/id/1031953
http://www.securityfocus.com/bid/73214
http://blog.mybb.com/2015/02/15/mybb-1-8-4-released-feature-update-security-maintenance-release/