CVE-2026-125370 Kubero 3.0.0 through 3.1.1 Authentication Bypass via Hardcoded JWT Secret
CriticalCVSS 9.3
- Published
- Updated
- Exploit status
- No public exploit known
Description
Kubero 3.0.0 through 3.1.1 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to forge administrative JWTs by using a hardcoded fallback signing secret when JWT_SECRET is unset. Attackers can sign tokens with arbitrary role, userGroups and permissions claims, which JwtStrategy.validate() trusts without a database lookup, to take control of pipelines, applications, users and API tokens.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kubero-dev kubero | >= 3.0.0, <= 3.1.1 | No fix listed |
References
- GitHub Issue #786 issue-tracking
- github.com product
- github.com technical-description
- VulnCheck Advisory: Kubero 3.0.0 through 3.1.1 Authentication Bypass via Hardcoded JWT Secret third-party-advisory