CVE-2026-16736: Unknown User Registration & Membership

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The User Registration & Membership WordPress plugin before 5.2.6 does not enforce the site's registration-disabled setting when processing registration-form submissions, allowing unauthenticated users to create new accounts even when the administrator has turned off open registration.

Affected products

• Unknown User Registration & Membership: before 5.2.6 (fixed in 5.2.6)

Published 2026-08-05. Last modified 2026-08-26.