CVE-2026-19423: CWE-269 Improper Privilege Management in Ultimate Member
Description
Ultimate Member WordPress plugin versions before 2.13.0 contain an improper privilege management vulnerability that allows unauthenticated users registering through the plugin's own form to assign themselves arbitrary roles, including administrator-level access. This occurs because the plugin validates role selections against the site's registered roles rather than the form's allowed roles. The vulnerability has a high severity with a CVSS score of 8.1.
CVSS v3.1
Score 8.1high
Affected software
Ultimate Member
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-19423 is an improper privilege management vulnerability (CWE-269) in the Ultimate Member WordPress plugin before version 2.13.0. The plugin fails to properly validate submitted role selections during user registration when it cannot resolve the permitted roles for a profile form. Instead of checking against the form's allow-list, it validates against all registered site roles, enabling unauthenticated users to assign themselves arbitrary capabilities, including administrator-equivalent privileges.
Potential Impact
Exploitation of this vulnerability allows unauthenticated attackers to escalate privileges by registering accounts with arbitrary roles, potentially gaining full administrative control over the affected WordPress site. This can lead to complete compromise of site confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict or disable user registrations through the Ultimate Member plugin forms to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-08-10T11:01:48.677Z
- State
- PUBLISHED
Threat ID: 6a913ad1acd9273b4992fa15
Added to database: 08/28/2026, 07:37:53 UTC
Last enriched: 09/08/2026, 09:52:27 UTC
Last updated: 10/13/2026, 06:48:15 UTC
Views: 63
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