{"id":"CVE-2026-125370","state":"PUBLISHED","title":"Kubero 3.0.0 through 3.1.1 Authentication Bypass via Hardcoded JWT Secret","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.","publishedAt":"2026-11-09T23:27:41.949Z","updatedAt":"2026-11-09T23:27:41.949Z","severity":{"score":9.3,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["kubero-dev kubero"],"affected":[{"vendor":"kubero-dev","product":"kubero","defaultStatus":"unaffected","versions":[{"version":"3.0.0","status":"affected","lessThanOrEqual":"3.1.1","versionType":"semver"}]}],"references":["https://github.com/kubero-dev/kubero/issues/786","https://github.com/kubero-dev/kubero","https://github.com/kubero-dev/kubero/blob/bcb52376b19347b8c36bc445ddf3e4bff4a5c168/server/src/auth/strategies/jwt.strategy.ts#L13-L32","https://www.vulncheck.com/advisories/kubero-3.0.0-through-3.1.1-authentication-bypass-via-hardcoded-jwt-secret"],"weaknesses":["CWE-321"],"ingestedAt":"2026-11-09T23:36:06.628Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/125xxx/CVE-2026-125370.json","commit":"b5e35fd13cceb3fc2d7ace24f43c95cd80e7dc5f","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-125370","state":"PUBLISHED","datePublished":"2026-11-09T23:27:41.949Z","dateUpdated":"2026-11-09T23:27:41.949Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-11-09T22:03:03.950Z"},"containers":{"cna":{"title":"Kubero 3.0.0 through 3.1.1 Authentication Bypass via Hardcoded JWT Secret","descriptions":[{"lang":"en","value":"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":[{"vendor":"kubero-dev","product":"kubero","defaultStatus":"unaffected","versions":[{"version":"3.0.0","status":"affected","lessThanOrEqual":"3.1.1","versionType":"semver"}]}],"references":[{"url":"https://github.com/kubero-dev/kubero/issues/786","tags":["issue-tracking"],"name":"GitHub Issue #786"},{"url":"https://github.com/kubero-dev/kubero","tags":["product"]},{"url":"https://github.com/kubero-dev/kubero/blob/bcb52376b19347b8c36bc445ddf3e4bff4a5c168/server/src/auth/strategies/jwt.strategy.ts#L13-L32","tags":["technical-description"]},{"url":"https://www.vulncheck.com/advisories/kubero-3.0.0-through-3.1.1-authentication-bypass-via-hardcoded-jwt-secret","name":"VulnCheck Advisory: Kubero 3.0.0 through 3.1.1 Authentication Bypass via Hardcoded JWT Secret","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":9.3,"baseSeverity":"CRITICAL"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-321","lang":"en","description":"Use of Hard-coded Cryptographic Key","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-11-09T23:27:41.949Z"},"datePublic":"2026-08-26T00:00:00.000Z","credits":[{"lang":"en","value":"28Hus","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}