mod/forum/unsubscribeall.php in Moodle 2.1.x before 2.1.7 and 2.2.x before 2.2.4 does not consider whether a forum is optional, which allows remote authenticated users to bypass forum-subscription requirements by leveraging the student role and unsubscribing from all forums.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Moodle | Moodle | 2.1.0 (including) | 2.1.0 (including) |
| Moodle | Moodle | 2.1.1 (including) | 2.1.1 (including) |
| Moodle | Moodle | 2.1.2 (including) | 2.1.2 (including) |
| Moodle | Moodle | 2.1.3 (including) | 2.1.3 (including) |
| Moodle | Moodle | 2.1.4 (including) | 2.1.4 (including) |
| Moodle | Moodle | 2.1.5 (including) | 2.1.5 (including) |
| Moodle | Moodle | 2.1.6 (including) | 2.1.6 (including) |
| Moodle | Moodle | 2.2.0 (including) | 2.2.0 (including) |
| Moodle | Moodle | 2.2.1 (including) | 2.2.1 (including) |
| Moodle | Moodle | 2.2.2 (including) | 2.2.2 (including) |
| Moodle | Moodle | 2.2.3 (including) | 2.2.3 (including) |