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

Badges

👾 Exploit Exists🟡 Public PoC

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.

Affected Version(s)

OAuth Single Sign On – SSO (OAuth Client) 0 <= 6.26.12

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-9485-PoC
Created by ItsSunshineXD

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

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jonas Benjamin Friedli
.