CVE-2025-9485: Signature Bypass (CVSS 9.8)

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.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-347 CWE-347

References

Other References

https://plugins.trac.wordpress.org/browser/miniorange-login-with-eve-online-google-facebook/tags/6.26.12/class-mooauth-widget.php#L577 https://plugins.trac.wordpress.org/changeset/3360768/miniorange-login-with-eve-online-google-facebook https://www.wordfence.com/threat-intel/vulnerabilities/id/d2448afc-70d1-4dd5-b73b-62d182ee9a8a?source=cve

Frequently Asked Questions

What is 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 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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-9485? +

CVE-2025-9485 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

How do I check if I'm vulnerable to CVE-2025-9485? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-9485