{"cve":"CVE-2026-29000","nvd":{"published":"2026-03-04T22:16:18.783","modified":"2026-10-08T16:17:12.670","status":"Deferred","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_v4":{"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","score":9.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-347"],"references":["https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key","https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html","https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-29000","score":0.06088,"percentile":0.93364,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-pm7g-w2cf-q238","url":"https://osv.dev/vulnerability/GHSA-pm7g-w2cf-q238","summary":"pac4j-jwt: JwtAuthenticator Authentication Bypass via JWE-Wrapped PlainJWT","modified":"2026-03-06T15:56:22.914018Z","packages":[{"ecosystem":"Maven","name":"org.pac4j:pac4j-jwt","purl":"pkg:maven/org.pac4j/pac4j-jwt","ranges":[">=6.0.4.1 <6.3.3"],"fixed":["6.3.3"]},{"ecosystem":"Maven","name":"org.pac4j:pac4j-jwt","purl":"pkg:maven/org.pac4j/pac4j-jwt","ranges":[">=5.0.0-RC1 <5.7.9"],"fixed":["5.7.9"]},{"ecosystem":"Maven","name":"org.pac4j:pac4j-jwt","purl":"pkg:maven/org.pac4j/pac4j-jwt","ranges":["<4.5.9"],"fixed":["4.5.9"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}