CVE-2026-19423: Unknown Ultimate Member

High severity, CVSS 8.1. EPSS: 0.2% chance of exploitation in the next 30 days.

The Ultimate Member WordPress plugin before 2.13.0 does not validate a submitted role selection when it cannot resolve the set of roles a profile form permits, and screens the value against the site's registered role names rather than against the form's own allow-list, allowing unauthenticated users who register through the Ultimate Member WordPress plugin before 2.13.0's own form to grant themselves arbitrary capabilities and reach administrator-equivalent access.

Affected products

• Unknown Ultimate Member: from 2.6.7, before 2.13.0 (fixed in 2.13.0)

Published 2026-08-28. Last modified 2026-08-28.