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CVE-2026-29000

pac4j-jwt JwtAuthenticator Authentication Bypass

Published: Mar 4, 2026Updated: Apr 16, 2026 Sources: CVE List NVD GHSA BDUCWE-347
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
5.9%
Top 7.8%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-347

Affected Products

org.pac4j:pac4j-jwtMavenOSS Libraries
pac4j-jwtpac4j
Library
OSS Libraries / generic-library
pac4j-jwtСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
mavenpackage-ecosystemOSS Libraries
pac4joss-projectOSS Libraries
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key
codeant.ai
https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html
pac4j.org
https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass
vulncheck.com
and 6 more references View all →

Timeline

Published
Mar 4, 2026
Last Updated
Apr 16, 2026

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