Moodle Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2014-7833
mod/data/edit.php in Moodle through 2.4.11 2.5.x before 2.5.9 2.6.x before 2.6.6 and 2.7.x before 2.7.3 sets a certain group ID to zero upon a database-entry change which allows remote authenticated users to obtain sensitive information by accessing the database after an edit by a teacher.