Moodle Permissions Privileges and Access Controls Vulnerability - CVE-2014-7846
tag/tag_autocomplete.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 does not consider the moodle/tag:edit capability before adding a tag which allows remote authenticated users to bypass intended access restrictions via an AJAX request.