Multiple cross-site request forgery (CSRF) vulnerabilities in MyBB 1.2.11 and earlier allow remote attackers to (1) hijack the authentication of moderators or administrators for requests that delete threads via a do_multideletethreads action to moderation.php and (2) hijack the authentication of arbitrary users for requests that delete private messages (PM) via a delete action to private.php.
CWE-352