CVE-2026-16149
Description
The Security Hardener plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 2.4.4. The vulnerability exists because the plugin's user-enumeration protection, which is enabled by default, hooks the rest_endpoints filter via secure_user_endpoints() and overwrites every registered handler's permission_callback on both the /wp/v2/users and /wp/v2/users/(?P<id>[\d]+) routes — including POST, PUT, PATCH, and DELETE handlers — with a bare closure that returns only is_user_logged_in(), completely stripping WordPress Core's original capability checks such as create_users, promote_user, edit_users, and delete_users that WP_REST_Users_Controller normally enforces. This makes it possible for authenticated attackers with Subscriber-level access and above to create new Administrator accounts by sending POST request to /wp/v2/users with administrator role, or to reset an existing Administrator's password by issuing a PUT/POST request to /wp/v2/users/<id>. Because the block_user_enum option defaults to enabled, no special plugin configuration is required — the overwrite is active on every request as soon as the plugin is installed.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://plugins.trac.wordpress.org/browser/security-hardener/tags/2.4.4/security-hardener.php#L107
- https://plugins.trac.wordpress.org/browser/security-hardener/tags/2.4.4/security-hardener.php#L180
- https://plugins.trac.wordpress.org/browser/security-hardener/tags/2.4.4/security-hardener.php#L204
- https://plugins.trac.wordpress.org/browser/security-hardener/tags/2.4.4/security-hardener.php#L428
- https://plugins.trac.wordpress.org/browser/security-hardener/tags/2.4.4/security-hardener.php#L433
- https://plugins.trac.wordpress.org/browser/security-hardener/tags/2.4.4/security-hardener.php#L439
- https://plugins.trac.wordpress.org/changeset/3630896/security-hardener
- https://www.wordfence.com/threat-intel/vulnerabilities/id/64f1a71f-e210-4191-bfb4-56f8568180ed?source=cve
CWEs
CWE-269
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.