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.
Moodle before 2.2.2 has a password and web services issue where when the user profile is updated the user password is reset if not specified.
comment/lib.php in Moodle 2.0.x before 2.0.4 and 2.1.x before 2.1.1 does not properly restrict comment capabilities, which allows remote attackers to post a comment by leveraging the guest role and operating on a front-page activity.