Vulnerability Intelligence Report
OAuth Single Sign On – SSO (OAuth Client) <= 6.26.12 - Authentication Bypass via get_resource_owner_from_id_token()
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.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:0.57%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-347 ↗CWE-347 Improper Verification of Cryptographic Signature
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| cyberlord92 | OAuth Single Sign On – SSO (OAuth Client) | 0 <= 6.26.12 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.571%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Wordfence · Vendor · USA |
| Reserved | 2025-08-26T08:59:36 |
| Published | 2025-10-04T02:24:37 |
| Last Updated | 2026-04-08T17:25:21 |
Community Chatter & Buzz