Moodle Permissions Privileges and Access Controls Vulnerability - CVE-2016-2190
Moodle through 2.6.11 2.7.x before 2.7.13 2.8.x before 2.8.11 2.9.x before 2.9.5 and 3.0.x before 3.0.3 does not properly restrict links which allows remote attackers to obtain sensitive URL information by reading a Referer log.