CVE-2011-5131
Cross-site request forgery (CSRF) vulnerability in global.php in MyBB before 1.6.5 allows remote attackers to hijack the authentication of a user for requests that change the user’s language via the language parameter.
Date published : 2012-08-30
http://www.securityfocus.com/bid/50816
MyBB 1.6.5 Released – Feature Update, Security & Maintenance Release