{"id":"CVE-2026-106487","state":"PUBLISHED","title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","description":"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.","publishedAt":"2026-10-06T20:36:45.419Z","updatedAt":"2026-10-09T01:49:45.471Z","severity":{"score":3.5,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["backstage backstage","@backstage plugin-kubernetes-backend"],"affected":[{"vendor":"backstage","product":"backstage","versions":[{"version":"< 1.54.6","status":"affected"}]},{"vendor":"@backstage","product":"plugin-kubernetes-backend","versions":[{"version":"< 0.21.10","status":"affected"}]}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr","https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946","https://github.com/backstage/backstage/releases/tag/v1.54.6"],"weaknesses":["CWE-441"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/106xxx/CVE-2026-106487.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-106487","state":"PUBLISHED","datePublished":"2026-10-06T20:36:45.419Z","dateUpdated":"2026-10-09T01:49:45.471Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-06T18:46:47.766Z"},"containers":{"cna":{"title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"backstage","product":"backstage","versions":[{"version":"< 1.54.6","status":"affected"}]},{"vendor":"@backstage","product":"plugin-kubernetes-backend","versions":[{"version":"< 0.21.10","status":"affected"}]}],"references":[{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr","name":"https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946","name":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946","tags":["x_refsource_MISC"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","name":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC"]}],"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","lang":"en","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-06T20:36:45.419Z"},"source":{"advisory":"GHSA-h53x-hjx6-25gr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-09T01:49:36.578700Z","id":"CVE-2026-106487","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-09T01:49:45.471Z"}}]}}}