CVE-2026-19423
Deferred Deferred - Pending Action

Unauthenticated Privilege Escalation in Ultimate Member

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: WPScan

Description
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.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-09-17
AI Q&A
2026-08-28
EPSS Evaluated
2026-09-15
NVD
CVE-2026-19423
EUVD
EUVD-2026-67570

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
ultimate_member ultimate_member to 2.13.0 (exc)
ultimate_member ultimate_member From 2.6.7 (inc) to 2.12.1 (inc)
ultimate_member ultimate_member 2.13.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-269 The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

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Executive Summary

This vulnerability affects the Ultimate Member WordPress plugin versions 2.6.7 to 2.12.1. It allows unauthenticated users to escalate privileges by exploiting improper role validation. When a user submits a role selection on a profile form, the plugin fails to validate it against the form's allow-list. Instead, it checks against all registered site roles, enabling users to assign themselves arbitrary capabilities and gain administrator-equivalent access.

Detection Guidance

Check if the Ultimate Member plugin version is between 2.6.7 and 2.12.1. Use WordPress admin panel or run: wp plugin list --name=ultimate-member --fields=name,version

Impact Analysis

If you use the affected versions of the Ultimate Member plugin, an attacker could register through the plugin's form and escalate their privileges to gain full administrative access. This could allow them to take control of your WordPress site, modify content, install malicious plugins, or steal sensitive data.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating compliance requirements under GDPR and HIPAA. Unauthorized privilege escalation may result in exposure of personal or protected health information, leading to legal penalties, fines, and reputational damage.

Mitigation Strategies

Update the Ultimate Member plugin to version 2.13.0 or later immediately. Disable user registration forms if not needed or restrict registration to trusted users.

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