pac4j-jwt JwtAuthenticator Authentication Bypass
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.
CVE-2026-29000
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-29000
pac4j-jwt
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/pac4j/pac4j",
"vendor": "pac4j",
"product": "pac4j-jwt",
"versions": [
{
"status": "affected",
"version": "4.0",
"lessThan": "4.5.9",
"versionType": "custom"
},
{
"status": "affected",
"version": "5.0",
"lessThan": "5.7.9",
"versionType": "custom"
},
{
"status": "affected",
"version": "6.0",
"lessThan": "6.3.3",
"versionType": "custom"
}
],
"packageURL": "pkg:maven/org.pac4j/pac4j-jwt",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-29000
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #12706 · Revision 1
- Added to Heist Feed
- Publisher date