Multiple cross-site request forgery (CSRF) vulnerabilities in Moodle 2.0.x before 2.0.2 allow remote attackers to hijack the authentication of arbitrary users for requests that mark the completion of (1) an activity or (2) a course.
http://openwall.com/lists/oss-security/2011/11/14/1
http://moodle.org/mod/forum/discuss.php?d=170006
http://git.moodle.org/gw?p=moodle.git%3Ba=commit%3Bh=9cedb80c5d6318aa17cd66912d37e6ef3dca9455