CVE-2025-9485: CYBERLORD92 OAuth Single Sign On – SSO OAuth Client

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• CYBERLORD92 OAuth Single Sign On – SSO OAuth Client: up to and including 6.26.12

Published 2025-10-04. Last modified 2026-10-08.