The RealHomes Memberships plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.0.9. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to grant themselves any premium membership tier without completing a PayPal transaction, generating a falsified active payment receipt and gaining unauthorized access to restricted property listing allowances.