repository/alfresco/lib.php in Moodle through 2.3.11, 2.4.x before 2.4.9, 2.5.x before 2.5.5, and 2.6.x before 2.6.2 places a session key in a URL, which allows remote attackers to bypass intended Alfresco Repository file restrictions by impersonating a file's owner.
https://moodle.org/mod/forum/discuss.php?d=256422
http://openwall.com/lists/oss-security/2014/03/17/1
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-29409