CVE-2025-9891

MEDIUM 4.3

User Sync – Remote User Sync <= 1.0.2 - Cross-Site Request Forgery to Plugin Deactivation

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-352
Vendor	cyberlord92
Product	user sync
Published	Sep 17, 2025
Last Updated	Apr 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

cyberlord92 / User Sync

0 ≤ 1.0.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Jonas Benjamin Friedli