CVE-2026-125370

CRITICAL 9.8

Kubero 3.0.0 through 3.1.1 Authentication Bypass via Hardcoded JWT Secret

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-321
Vendor	kubero-dev
Product	kubero
Published	Nov 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

kubero-dev / kubero

3.0.0 ≤ 3.1.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/kubero-dev/kubero/issues/786 github.com: https://github.com/kubero-dev/kubero github.com: https://github.com/kubero-dev/kubero/blob/bcb52376b19347b8c36bc445ddf3e4bff4a5c168/server/src/auth/strategies/jwt.strategy.ts#L13-L32 vulncheck.com: https://www.vulncheck.com/advisories/kubero-3.0.0-through-3.1.1-authentication-bypass-via-hardcoded-jwt-secret

Credits

28Hus