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This issue is fixed in version 0.21.10."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.5,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-441","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-10-06T20:36:45.419Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr"},{"name":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946","tags":["x_refsource_MISC"],"url":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946"},{"name":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC"],"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"}],"source":{"advisory":"GHSA-h53x-hjx6-25gr","discovery":"UNKNOWN"},"title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-106487","datePublished":"2026-10-06T20:36:45.419Z","dateReserved":"2026-10-06T18:46:47.766Z","dateUpdated":"2026-10-06T20:36:45.419Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 21:17:17","lastModifiedDate":"2026-10-06 21:17:17","problem_types":["CWE-441","CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","baseScore":3.5,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":1.4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"106487","Ordinal":"1","Title":"Backstage: Unsupported catalog cluster authentication mode in ku","CVE":"CVE-2026-106487","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"106487","Ordinal":"1","NoteData":"Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.","Type":"Description","Title":"Backstage: Unsupported catalog cluster authentication mode in ku"}]}}}