CVE-2026-125370 Kubero 3.0.0 through 3.1.1 Authentication Bypass via Hardcoded JWT Secret
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-125370?
CVE-2026-125370 is a critical vulnerability in kubero-dev kubero, published on 9 Nov 2026.
Official 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.
Weakness: CWE-321
Which versions are affected by CVE-2026-125370?
How do I fix CVE-2026-125370?
No fix has been published for CVE-2026-125370 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-125370 being exploited?
There is no known exploitation of CVE-2026-125370 in the wild and no public exploit code.
Sources
Also known as GHSA-42fc-m93g-j65w.