{"id":"CVE-2026-29000","title":"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","summary":"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 …","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-347"],"vendor":"pac4j","product":"pac4j-jwt","affected":["pac4j-jwt >= 4.0 < 4.5.9","pac4j-jwt >= 5.0 < 5.7.9","pac4j-jwt >= 6.0 < 6.3.3"],"published":"2026-03-04","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:12.670","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-29000","references":[{"url":"https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key","label":"disclosure@vulncheck.com"},{"url":"https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-03-07T04:55:36.270180Z"},"epss":0.00502,"epssPercentile":0.41007,"exploits":{"github":21,"githubRepos":["https://github.com/kernelzeroday/CVE-2026-29000","https://github.com/Strikoder-Premium/CVE-2026-29000-pac4j-jwt","https://github.com/tc4dy/CVE-2026-29000-PoC-Exploit"],"checkedAt":"2026-10-08T16:52:49.760Z"},"ingestedAt":"2026-10-08T16:52:14.674Z","slug":"CVE-2026-29000","body":"## Overview\n\npac4j-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":62,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}