| Package | Affected versions | Patched versions |
|---|---|---|
| moodle | = 2.1.0= 2.1.1= 2.1.2= 2.1.3= 2.1.4= 2.1.5= 2.1.6= 2.2.0= 2.2.1= 2.2.2= 2.2.3 |
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.
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