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Vulnerability DatabaseCVE-2025-9891

CVE-2025-9891: 
WordPress vulnerability analysis and mitigation

Overview

The User Sync – Remote User Sync plugin for WordPress contains a Cross-Site Request Forgery (CSRF) vulnerability in versions up to and including 1.0.2, discovered on September 16, 2025. The vulnerability exists in the mousersyncformhandler() function due to missing or incorrect nonce validation (NVD, Wordfence).

Technical details

The vulnerability is tracked as CVE-2025-9891 with a CVSS v3.1 Base Score of 4.3 (Medium). The attack vector is Network (AV:N), with Low attack complexity (AC:L), requiring No privileges (PR:N), and User interaction (UI:R). The scope is Unchanged (S:U), with No impact to confidentiality (C:N), Low impact to integrity (I:L), and No impact to availability (A:N) (NVD).

Impact

When exploited, this vulnerability allows unauthenticated attackers to deactivate the plugin by tricking site administrators into performing specific actions, such as clicking on a malicious link (NVD).

Mitigation and workarounds

Users should update to a version newer than 1.0.2 when available. The vulnerability was identified in the mousersyncformhandler() function located at line 118 in the plugin's main file (WordPress Plugin).

Community reactions

The vulnerability was discovered and reported by security researcher Jonas Benjamin Friedli (Wordfence).

Additional resources

Source: This report was generated using AI

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