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Vulnerabilities CVE-2026-29000

CVE-2026-29000

Critical
Open
TLP:CLEAR

pac4j-jwt JwtAuthenticator Authentication Bypass

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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.

Details

CVSS Score
9.3
EPSS Score
5.86%

92.5th percentile

CVSS Vector
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
Confidence
90%
Published
Mar 4, 2026
Last Modified
Jul 14, 2026
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