CVE-2026-125370
CRITICAL
NVD
CVSS Score
9.8
Severity
CRITICAL
Published
Nov 10, 2026
Vendor
unknown
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.
References
- https://github.com/kubero-dev/kubero
- https://github.com/kubero-dev/kubero/blob/bcb52376b19347b8c36bc445ddf3e4bff4a5c168/server/src/auth/strategies/jwt.strategy.ts#L13-L32
- https://github.com/kubero-dev/kubero/issues/786
- https://www.vulncheck.com/advisories/kubero-3.0.0-through-3.1.1-authentication-bypass-via-hardcoded-jwt-secret