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.
History

Mon, 06 Oct 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 06 Oct 2025 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Oauth Client Single Sign On Project
Oauth Client Single Sign On Project oauth Client Single Sign On
Wordpress
Wordpress wordpress
Vendors & Products Oauth Client Single Sign On Project
Oauth Client Single Sign On Project oauth Client Single Sign On
Wordpress
Wordpress wordpress

Sat, 04 Oct 2025 02:30:00 +0000

Type Values Removed Values Added
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.
Title OAuth Single Sign On – SSO (OAuth Client) <= 6.26.12 - Authentication Bypass via get_resource_owner_from_id_token()
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2025-10-06T14:16:32.877Z

Reserved: 2025-08-26T08:59:36.029Z

Link: CVE-2025-9485

cve-icon Vulnrichment

Updated: 2025-10-06T14:14:16.651Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-10-04T03:15:38.780

Modified: 2025-10-06T14:56:47.823

Link: CVE-2025-9485

cve-icon Redhat

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