CVE-2026-29000

CRITICAL

9.1

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.

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/4/2026

Last Modified3/10/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-347

References

https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key(disclosure@vulncheck.com)

https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass(disclosure@vulncheck.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.