OAuth Single Sign On – SSO (OAuth Client) <= 6.26.12 - Authentication Bypass via get_resource_owner_from_id_token()

Improper Verification of Cryptographic Signature
CVE CVE-2025-9485
CVSS Critical (9.8)
Publicly Published October 3, 2025
Last Updated October 4, 2025
Researcher Jonas Benjamin Friedli
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.

References

1 affected software package

Software Type Plugin
Software Slug miniorange-login-with-eve-online-google-facebook (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 6.26.12
Patched Version
  • 6.26.13
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