CVE-2026-11966: Unknown User Registration & Membership

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The User Registration & Membership WordPress plugin before 5.2.3 does not perform a capability check for unauthenticated callers on one of its membership payment actions and acts on a caller-supplied user identifier, allowing unauthenticated attackers to delete recently-registered, payment-pending user accounts.

Affected products

• Unknown User Registration & Membership: from 4.2.3, before 5.2.3 (fixed in 5.2.3)

Published 2026-07-17. Last modified 2026-07-17.