The vulnerability was found Moodle which exists because the application allows a user to control path of the older to create in TinyMCE loaders. A remote user can send a specially crafted HTTP request and create arbitrary folders on the system.
https://moodle.org/mod/forum/discuss.php?d=446285
https://bugzilla.redhat.com/show_bug.cgi?id=2188605
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-77718