Improper Authentication in lua-resty-jwt - #VU163200
Published: November 9, 2026
Vulnerability identifier: #VU163200
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: N/A
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to bypass authentication using forged tokens.
The vulnerability exists due to lua-resty-jwt accepting public key PEM text as a PBES2 password when applications use that key to verify asymmetrically signed JWTs and receive an attacker-supplied JWE. An unauthenticated remote attacker can encrypt a JWE using the known public key text and have attacker-chosen claims accepted as authenticated.
Affected software
lua-resty-jwt
Remediation
Install security update from vendor's website.
lua-resty-jwt - update to 0.4.0