What is the CVSS score of CVE-2025-40934?

CVE-2025-40934 has a CVSS 3.1 base score of 9.3 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Jwt Attack are affected by CVE-2025-40934?

CVE-2025-40934 presents critical security risk, a signature bypass vulnerability rated CVSS 9.3.. A patch is available.

How to fix or mitigate CVE-2025-40934?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Vendor patch is available.

Jwt Attack CVE-2025-40934

CRITICAL

Improper Verification of Cryptographic Signature (CWE-347)

2025-11-26 9b29abf9-4ab0-4765-b253-1875cd9b441e

Jwt Attack Information Disclosure

9.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.3 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:24 vuln.today

Patch released

Mar 28, 2026 - 19:24 nvd

Patch available

CVE Published

Nov 26, 2025 - 23:15 nvd

CRITICAL 9.3

DescriptionCVE.org

XML-Sig versions 0.27 through 0.67 for Perl incorrectly validates XML files if signatures are omitted.

An attacker can remove the signature from the XML document to make it pass the verification check.

XML-Sig is a Perl module to validate signatures on XML files. An unsigned XML file should return an error message. The affected versions return true when attempting to validate an XML file that contains no signatures.

AnalysisAI

XML-Sig versions 0.27 through 0.67 for Perl incorrectly validates XML files if signatures are omitted. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

Technical ContextAI

This vulnerability is classified under CWE-347. XML-Sig versions 0.27 through 0.67 for Perl incorrectly validates XML files if signatures are omitted. An attacker can remove the signature from the XML document to make it pass the verification check. XML-Sig is a Perl module to validate signatures on XML files. An unsigned XML file should return an error message. The affected versions return true when attempting to validate an XML file that contains no signatures. Affected products include: Xml\ \. Version information: through 0.67.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.