What the vulnerability does
01Description
The ProfilePress plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 4.16.11. This is due to missing ownership validation on the change_plan_sub_id parameter in the process_checkout() function. The ppress_process_checkout AJAX handler accepts a user-controlled subscription ID intended for plan upgrades, loads the subscription record, and cancels/expires it without verifying the subscription belongs to the requesting user. This makes it possible for authenticated attackers, with Subscriber-level access and above, to cancel and expire any other user's active subscription via the change_plan_sub_id parameter during checkout, causing immediate loss of paid access for victims.
Explanation of Vulnerability in Simple Terms
02Summary
ProfilePress versions up to 4.16.11 contain an authorization flaw that allows authenticated users to modify or delete data they should not have access to. An attacker with a low-privilege account can alter user profiles, membership settings, or form configurations without proper permission checks. This affects sites using ProfilePress for membership, user registration, or content restriction.
What an attacker can do
03Attacker Capabilities
Modify or delete user data, membership records, or form settings without authorization.
Potential impact on your site
04Site Impact
User data, memberships, and site configuration can be altered or destroyed by any logged-in user.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege user account on the site; no user interaction required.
Key dates
06Disclosure timeline
March 11, 2026
CVE published
April 8, 2026
Record updated
