CVE-2025-9485 OAuth Single Sign On – SSO (OAuth Client) <= 6.26.12 - Authentication Bypass via get_resource_owner_from_id_token()
Unauthenticated attackers can bypass authentication via unsafe JWT processing to access any user account or create subscriber accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-9485?
CVE-2025-9485 is a critical authentication bypass vulnerability in cyberlord92 OAuth Single Sign On – SSO (OAuth Client), published on 4 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The OAuth Single Sign On – SSO (OAuth Client) plugin for WordPress is vulnerable to Improper Verification of Cryptographic Signature in versions up to, and including, 6.26.12. This is due to the plugin performing unsafe JWT token processing without verification or validation in the `get_resource_owner_from_id_token` function. This makes it possible for unauthenticated attackers to bypass authentication and gain access to any existing user account - including administrators in certain configurations - or to create arbitrary subscriber-level accounts.
Weakness: CWE-347
Which versions are affected by CVE-2025-9485?
How do I fix CVE-2025-9485?
No fix has been published for CVE-2025-9485 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-9485 being exploited?
There is no known exploitation of CVE-2025-9485 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-44hx-mv5h-wj6c.