CVE-2026-11963: Unknown User Registration & Membership

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The User Registration & Membership WordPress plugin before 5.2.2 does not perform an authorization check on a membership-upgrade action and derives the user to modify from a caller-supplied identifier instead of the current user, allowing any authenticated user such as a subscriber to change another user's WordPress role and membership tier.

Affected products

• Unknown User Registration & Membership: before 5.2.2 (fixed in 5.2.2)

Published 2026-07-13. Last modified 2026-07-13.