Description
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.13.1 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to view privacy-restricted member profile field values — including fields explicitly configured as owner-only, members-only, or role-restricted — by querying the publicly accessible wp_ajax_nopriv_um_get_members endpoint. The nonce required by the endpoint ('um-frontend-nonce') is emitted to all unauthenticated visitors via wp_localize_script, meaning it provides no meaningful access control and any anonymous visitor can satisfy the endpoint's authentication requirements.
References8
- github.com/ultimatemember/ultimatemember/releases/tag/2.14.0
- plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/…
- plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/…
- plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/…
- plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/…
- plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/…
- plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/…
- www.wordfence.com/threat-intel/vulnerabilities/id/cde81421-e080…
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 1% percentile: 44 · as of 10 November 2026
- CWE
- CWE-862
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.