Privilege escalation in Ultimate Member
CVE-2026-19423
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.
Vulnerability class: Privilege Escalation
EPSS: 0.001 (4.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Unknown Ultimate Member
Weakness classification (CWE)
References
- contact@wpscan.com (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-19423?
- CVE-2026-19423 is a high-severity vulnerability in Ultimate Member, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-08-28.
- How severe is CVE-2026-19423?
- High severity. CVSS v3 base score is 8.1 out of 10.