Moodle Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2016-2154
admin/tool/monitor/lib.php in Event Monitor in Moodle 2.8.x before 2.8.11 2.9.x before 2.9.5 and 3.0.x before 3.0.3 does not consider the moodle/course:viewhiddencourses capability which allows remote authenticated users to discover hidden course names by subscribing to a rule.