CVE-2025-9891 json
User Sync – Remote User Sync <= 1.0.2 - Cross-Site Request Forgery to Plugin Deactivation
published last yr. modified last mo. also EUVD-2025-29672
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
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() 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.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
Affected products
- cyberlord92 User Sync
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/6b60777e-6e07-42bd-9364-43367e209227?source=cve
- plugins.trac.wordpress.org /browser/user-sync/tags/1.0.1/mo-user-sync-main.php#L118
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3360328%40user-sync&new=3360328%40user-sync&sfp_email=&sfph_mai
Sources
- CVE List CVE-2025-9891
- NVD CVE-2025-9891
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.