CVE-2025-9891

The User Sync – Remote User Sync plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0.2. This is due to missing or incorrect nonce validation on the mo_user_sync_form_handler() function. This makes it possible for unauthenticated attackers to deactivate the plugin via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

• CWE-352

• https://plugins.trac.wordpress.org/browser/user-sync/tags/1.0.1/mo-user-sync-main.php#L118
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3360328%40user-sync&new=3360328%40user-sync&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/6b60777e-6e07-42bd-9364-43367e209227?source=cve

Published

Sep 17, 2025

Last Modified

Sep 26, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2025-9885The MPWizard – Create Mercado Pago Payment Links plugin for …4.3
• CVE-2025-9886The Trinity Audio – Text to Speech AI audio player to conver…4.3
• CVE-2025-9887The Custom Login And Signup Widget plugin for WordPress is v…4.3
• CVE-2025-9888The Maspik – Ultimate Spam Protection plugin for WordPress i…4.3
• CVE-2025-9889The ContentMX Content Publisher plugin for WordPress is vuln…4.3
• CVE-2025-9890The Theme Editor plugin for WordPress is vulnerable to Cross…8.8
• CVE-2025-9892The Restrict User Registration plugin for WordPress is vulne…5.3
• CVE-2025-9893The VM Menu Reorder plugin plugin for WordPress is vulnerabl…4.3
• CVE-2025-9894The Sync Feedly plugin for WordPress is vulnerable to Cross-…4.3
• CVE-2025-9895The Notification Bar plugin for WordPress is vulnerable to C…4.3
• CVE-2025-9896The HidePost plugin for WordPress is vulnerable to Cross-Sit…4.3
• CVE-2025-9897The AP Background plugin for WordPress is vulnerable to Cros…4.3