BuddyPress <= 14.3.3 - Insecure Direct Object Reference to Notifications Deletion

The BuddyPress plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 14.3.3 via the bp_notifications_action_bulk_manage due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete/mark as read/mark as unread notifications of other users.