CVE-2025-9485: The OAuth Single Sign On – SSO (OAuth Client) plugin for WordPress is vulnerable to Improper Verification of Cryptographic Signature in versions up to, and…

PriorityP271critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

0.56%

42.6th percentile

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

1 ranges

Vendor	Product	Version range	Fixed in
cyberlord92	oauth_single_sign_on_sso	<= 6.26.12	—

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