Critical severity9.1NVD Advisory· Published Mar 4, 2026· Updated Apr 16, 2026
CVE-2026-29000
CVE-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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
org.pac4j:pac4j-jwtMaven | >= 6.0.4.1, < 6.3.3 | 6.3.3 |
org.pac4j:pac4j-jwtMaven | >= 5.0.0-RC1, < 5.7.9 | 5.7.9 |
org.pac4j:pac4j-jwtMaven | < 4.5.9 | 4.5.9 |
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- github.com/advisories/GHSA-pm7g-w2cf-q238ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-29000ghsaADVISORY
- www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-keynvdWEB
- www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.htmlnvdWEB
- www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypassnvdWEB
News mentions
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