CVE-2025-9891 User Sync – Remote User Sync <= 1.0.2 - Cross-Site Request Forgery to Plugin Deactivation
Unauthenticated attackers can deactivate the User Sync plugin by tricking administrators into clicking a malicious link due to missing nonce validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-9891?
CVE-2025-9891 is a medium-severity vulnerability in cyberlord92 User Sync, published on 17 Sep 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-352
Which versions are affected by CVE-2025-9891?
How do I fix CVE-2025-9891?
No fix has been published for CVE-2025-9891 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-9891 being exploited?
There is no known exploitation of CVE-2025-9891 in the wild and no public exploit code.
Sources
Also known as GHSA-ph6f-26jp-xf5f.