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Jwt Attack CVE-2025-9485

| EUVDEUVD-2025-32415 CRITICAL
Improper Verification of Cryptographic Signature (CWE-347)
2025-10-04 security@wordfence.com
WordPress Authentication Bypass Jwt Attack Wordpress Plugin
9.8
CVSS 3.1 · Vendor: wordfence
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Vulnerability Assessment

Weakness
CWE
CWE-347
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Signature verification
Impact

CVSS 9.8, EPSS 0.65%.
Exploit ScenarioDerived

Forge OAuth tokens.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 0.7% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 13, 2026

Cryptographic signature bypass in OAuth SSO WordPress plugin. EPSS 0.65%.

Earlier versions of this analysis (1)
v1 Mar 13, 2026 - 19:56 CVSS 9.8

Signature bypass in OAuth SSO plugin.

RemediationAI

Update.

Affected VersionsENISA

OAuth Single Sign On – SSO (OAuth Client) * ≤6.26.12

Affected Packages

euvd oauth_single_sign_on_sso_oauth_client no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

CWE-347.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (wordfence) PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (wordfence) · only source for this CVE.

CVSS VectorVendor: wordfence

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

CVE-2025-9485 presents critical security risk, a signature bypass vulnerability rated CVSS 9.8. Successful exploitation could critically impact the confidentiality, integrity, and availability of affected systems. Organizations should apply vendor updates immediately when available and implement compensating controls in the interim.

Business Impact: Severe
Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score
0.7%
Top 29% exploitable
Data Quality
4 sources
Confidence: Medium
EUVD NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.7%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Very High

Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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Same weakness CWE-347 – Improper Verification of Cryptographic Signature

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References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-9485 REF https://plugins.trac.wordpress.org/browser/miniorange-login-with-eve-online-google-facebook/tags/6.26.12/class-mooauth-widget.php#L577 REF https://plugins.trac.wordpress.org/changeset/3360768/miniorange-login-with-eve-online-google-facebook REF https://www.wordfence.com/threat-intel/vulnerabilities/id/d2448afc-70d1-4dd5-b73b-62d182ee9a8a?source=cve

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