In Moodle 2.x and 3.x, SQL injection can occur via user preferences.

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

In Moodle 2.x and 3.x, the question engine allows access to files that should not be available.

In Moodle 2.x and 3.x, non-admin site managers may accidentally edit admins via web services.

In Moodle 2.x and 3.x, the capability to view course notes is checked in the wrong context.

In Moodle 2.x and 3.x, there is incorrect sanitization of attributes in forums.

In Moodle 2.x and 3.x, an unenrolled user still receives event monitor notifications even though they can no longer access the course.

In Moodle 2.x and 3.x, web service tokens are not invalidated when the user password is changed or forced to be changed.

lib/ajax/getnavbranch.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, when the forcelogin feature is enabled, allows remote attackers to obtain sensitive category-detail information from the navigation branch by leveraging the guest role for an Ajax request.

Cross-site request forgery (CSRF) vulnerability in mod/assign/adminmanageplugins.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 allows remote attackers to hijack the authentication of administrators for requests that manage Assignment plugins.