Cross-site request forgery (CSRF) vulnerability in the forum code in Moodle 1.7 before 1.7.7, 1.8 before 1.8.8, and 1.9 before 1.9.4 allows remote attackers to delete unauthorized forum posts via a link or IMG tag to post.php.
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.