Moodle Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2016-2151
user/index.php in 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 grants excessive authorization on the basis of the moodle/course:viewhiddenuserfields capability which allows remote authenticated users to discover student e-mail addresses by leveraging the teacher role and reading a Participants list.