Description

pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.

INFO

Published Date :

2026-03-04T21:49:29.340Z

Last Modified :

2026-03-04T22:18:27.284Z

Source :

VulnCheck
AFFECTED PRODUCTS

The following products are affected by CVE-2026-29000 vulnerability.

Vendors Products
Pac4j
  • Pac4j
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-29000.

URL Resource
https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key cve-icon cve-icon
https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html cve-icon cve-icon
https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact