Cross-site request forgery (CSRF) vulnerability in Moodle 1.9.x before 1.9.11 allows remote attackers to hijack the authentication of unspecified victims for requests that modify an RSS feed in an RSS block.
http://openwall.com/lists/oss-security/2011/11/14/1
http://moodle.org/mod/forum/discuss.php?d=170002
http://git.moodle.org/gw?p=moodle.git%3Ba=commit%3Bh=8f031d5431c1204197b1482fd6c63bc87a19a476