WordPress SSO (OAuth Client) plugin fixes 1 vulnerability

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[TLP:CLEAR] WordPress SSO (OAuth Client) plugin fixes 1 vulnerability

The SSO (OAuth Client) plugin for WordPress version 6.26.13 fixes one vulnerability [1].

SSO (OAuth Client) plugin - authentication bypass (CVE-2025-9485)

CVSS 9.8 (Critical)

Allows an unauthenticated remote attacker to bypass authentication and gain access to any existing account, or create arbitrary accounts with the subscriber role, through improper verification of the cryptographic signature of the JWT (ID token) in the get_resource_owner_from_id_token function of the SSO (OAuth Client) plugin for WordPress [1].

The vulnerability is present in product:

SSO (OAuth Client) plugin; <= 6.26.12

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

More information:

CVE-2025-9485 at cve.org, NVD
CWE-347: Improper Verification of Cryptographic Signature at cwe.mitre.org

The vulnerability was publicly disclosed 3. 10. 2025.

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[TLP:CLEAR] WordPress SSO (OAuth Client) plugin fixes 1 vulnerability

SSO (OAuth Client) plugin - authentication bypass (CVE-2025-9485)

CVSS 9.8 (Critical)

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