GHSA-pm7g-w2cf-q238
pac4j-jwt: JwtAuthenticator Authentication Bypass via JWE-Wrapped PlainJWT
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.pac4j:pac4j-jwt | >= 6.0.4.1, < 6.3.3 | 6.3.3 |
| Maven | org.pac4j:pac4j-jwt | >= 5.0.0-RC1, < 5.7.9 | 5.7.9 |
| Maven | org.pac4j:pac4j-jwt | < 4.5.9 | 4.5.9 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-29000
- https://github.com/pac4j/pac4j
- 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