Paid Membership Subscriptions WordPress plugin vulnerabilities

The Paid Membership Subscriptions WordPress plugin before 3.1.0 does not bind one of its unauthenticated payment actions to the requesting user. This allows someone who holds another member's in-flight payment identifier to delete that member's checkout state.

The Paid Membership Subscriptions WordPress plugin before 3.0.9 does not verify that the amount and currency reported by the payment provider match the pending payment before completing it. This allows unauthenticated users to obtain a paid membership by paying an arbitrary lower amount.

The Paid Membership Subscriptions WordPress plugin before version 3.0.8 does not verify that the subscription being modified through its change-subscription checkout belongs to the current user. This allows any authenticated user with Subscriber-level access and above to take over another member's subscription and overwrite its plan, status and expiration.

The Paid Membership Subscriptions WordPress plugin before version 3.0.7 does not protect the member and payment export files it writes to a predictable location in the uploads directory. Unauthenticated users can download these files, containing personal data (PII), while an export artifact is present.

The Paid Membership Subscriptions WordPress plugin before version 3.0.7 does not perform capability or nonce checks on one of its payment-related AJAX actions. Any authenticated user (Subscriber and above) can disclose the payment details of any member by enumerating the payment identifier.