ownCloud Server before 8.0.10, 8.1.x before 8.1.5, and 8.2.x before 8.2.2 allow remote authenticated users to obtain sensitive information from a directory listing and possibly cause a denial of service (CPU consumption) via the force parameter to index.php/apps/files/ajax/scan.php.
https://owncloud.org/security/advisory/?id=oc-sa-2016-002
http://www.securityfocus.com/archive/1/537556/100/0/threaded
http://www.securityfocus.com/archive/1/537244/100/0/threaded
http://packetstormsecurity.com/files/135158/ownCloud-8.2.1-8.1.4-8.0.9-Information-Exposure.html