---
id: CVE-2025-9891
title: >-
  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
summary: >-
  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() functi…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-352
published: '2025-09-17'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9891'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/user-sync/tags/1.0.1/mo-user-sync-main.php#L118
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3360328%40user-sync&new=3360328%40user-sync&sfp_email=&sfph_mail=
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/6b60777e-6e07-42bd-9364-43367e209227?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00199
epssPercentile: 0.08682
ingestedAt: '2026-09-26T00:22:39.921Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.