Vulnerability Advisory : Expire Users <= 1.2.2 - Authenticated (Subscriber+) Privilege Escalation to Administrator via save_extra_user_profile_fields with LOW Attack Complexity

The Expire Users plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.2.2. This is due to the plugin allowing a user to update the 'on_expire_default_to_role' meta through the 'save_extra_user_profile_fields' function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to elevate their privileges to that of an administrator.