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CVE-2026-19423 – Unauthenticated Privilege Escalation to Administrator – Ultimate Member WordPress P

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Summary

CVE-2026-19423 is an unauthenticated privilege escalation vulnerability in the Ultimate Member WordPress plugin. The plugin validates user-submitted role values during registration against the site’s list of registered roles rather than the registration form’s own allowlist, letting an unauthenticated attacker assign themselves administrator-equivalent capabilities. The issue carries a CVSS v3.1 base score of 8.1 (High).

Technical details

  • Root cause: During processing of profile/registration form submissions, the plugin checks the submitted role field against the site’s registered role names instead of the form’s configured allowed-roles list.
  • Trigger conditions: An attacker submits a registration or profile form with a role value corresponding to a registered site role (e.g., administrator) that is not intended to be selectable via the form.
  • Attack vector: Network-based, no authentication or user interaction required; attack complexity is rated High.
  • Impact: Unauthenticated users can grant themselves arbitrary capabilities, reaching administrator-equivalent access, with high impact to confidentiality, integrity, and availability of the affected WordPress site.

Affected software

  • Ultimate Member WordPress plugin, versions 2.6.7 through 2.12.1 (inclusive)

Severity

  • CVSS v3.1 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

Mitigation and recommended actions

  • Immediate: Upgrade the Ultimate Member plugin to version 2.13.0 or later, which fixes the role-validation logic.
  • If patching is not immediately possible: Restrict or disable public user registration and profile-editing forms provided by the plugin until the update can be applied, and review existing user accounts for unauthorized role/capability changes.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body: /wp-content/plugins/ultimate-member/

References

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