What the vulnerability does
01Description
The Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin for WordPress is vulnerable to unauthorized membership payment bypass in all versions up to, and including, 4.16.11. This is due to a missing ownership verification on the `change_plan_sub_id` parameter in the `process_checkout()` function. This makes it possible for authenticated attackers, with subscriber level access and above, to reference another user's active subscription during checkout to manipulate proration calculations, allowing them to obtain paid lifetime membership plans without payment via the `ppress_process_checkout` AJAX action.
Explanation of Vulnerability in Simple Terms
02Summary
ProfilePress versions up to 4.16.11 lack proper authorization checks, allowing authenticated users to modify content and settings they should not have access to. An attacker with a low-privilege account can escalate their capabilities by bypassing permission controls. The vulnerability affects membership, user registration, and profile management features. Update to a version newer than 4.16.11.
What an attacker can do
03Attacker Capabilities
Modify or change site content and settings beyond their assigned permissions.
Potential impact on your site
04Site Impact
Unauthorized users can alter membership rules, user data, or site configuration.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege user account on the site.
Key dates
06Disclosure timeline
April 4, 2026
CVE published
April 8, 2026
Record updated
