#VU121638 Improper verification of cryptographic signature in JSON Web Signatures - CVE-2025-65945

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Main Vulnerability Database Vulnerabilities #VU121638

#VU121638 Improper verification of cryptographic signature in JSON Web Signatures - CVE-2025-65945

Published: January 19, 2026


Vulnerability identifier: #VU121638
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-65945
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
JSON Web Signatures
Software vendor:
Auth0

Description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to improper signature verification under specific conditions when using the HS256 algorithm within the jws.createVerify() function. A remote attacker can manipulate header or payload in the HMAC secret lookup routines and bypass authorization checks. 


Remediation

Install updates from vendor's website.

External links