CVE-2026-29000CRITICAL 9.1EPSS p92.2%

CVE-2026-29000CVE-2026-29000

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS5.86% probability of exploitation · percentile 92.2% · 2026-06-18T12:00:27Z
Published2026-03-04
Last modified2026-04-16

Underlying weaknesses· 1

CWE-347

References

  1. https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key
  2. https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html
  3. https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass

1

TypeTargetConfidenceTier
WeaknessImproper Verification of Cryptographic Signaturecwe-3470%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.