Improper Cryptographic Signature Verification in WordPress Plugin by miniOrange
CVE-2025-9485

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Oauth Single Sign On – Sso (oauth Client)
Vendor
CVE Published:
4 October 2025

What is CVE-2025-9485?

The OAuth Single Sign On – SSO (OAuth Client) plugin for WordPress suffers from a significant vulnerability due to its improper handling of JSON Web Tokens (JWT). Versions up to and including 6.26.12 do not adequately verify or validate the signatures of incoming tokens in the get_resource_owner_from_id_token function. This oversight enables unauthenticated attackers to bypass the authentication mechanisms, potentially accessing existing user accounts, including those of administrators under specific configurations. Additionally, attackers could create arbitrary subscriber-level accounts, compromising the security of the WordPress site.

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Affected Version(s)

OAuth Single Sign On – SSO (OAuth Client) * <= 6.26.12

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/miniorange-log...
https://plugins.trac.wordpress.org/changeset/3360768/mini...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jonas Benjamin Friedli
JSON
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