#VU124066 Improper Verification of Cryptographic Signature in authlib - CVE-2026-27962

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Main Vulnerability Database Vulnerabilities #VU124066

#VU124066 Improper Verification of Cryptographic Signature in authlib - CVE-2026-27962

Published: March 17, 2026


Vulnerability identifier: #VU124066
Vulnerability risk: Critical
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Red
CVE-ID: CVE-2026-27962
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
authlib
Software vendor:
Authlib

Description

The vulnerability allows a remote attacker to bypass authentication checks.

The vulnerability exists due to improper validation of HTTP headers. A remote attacker can forge arbitrary JWT tokens that pass signature verification and bypass authentication checks. 


Remediation

Install updates from vendor's website.

External links