Paid Member Subscriptions < 2.16.9 - Authenticated (Subscriber+) Insecure Direct Object Reference

Description

The Paid Membership Subscriptions – Effortless Memberships, Recurring Payments & Content Restriction plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 2.16.8 due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, to perform an unauthorized action.