{"schema":"threatline.record/2","record":{"id":"CVE-2026-106487","aliases":["GHSA-h53x-hjx6-25gr"],"summary":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","details":"### Impact\n\nDeployments 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.\n\n### Patches\n\nPatched in `@backstage/plugin-kubernetes-backend` version `0.21.10`\n\n### Workarounds\n\n- Do not configure service account authentication through catalog-provided clusters; use the supported static configuration method when service account authentication is required.\n- Restrict catalog ingestion so untrusted users cannot create or alter Kubernetes cluster Resource entities.","categories":["Containers & cloud"],"product":"@backstage/plugin-kubernetes-backend","vendor":"backstage","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-h53x-hjx6-25gr","source_modified_at":"2026-10-07T18:01:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-kubernetes-backend"},"range":"< 0.21.10"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106487","source_modified_at":"2026-10-09T01:49:45.471Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"backstage","vendor":"backstage","versions":[{"version":"< 1.54.6","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106487","source_modified_at":"2026-10-09T01:49:45.471Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"plugin-kubernetes-backend","vendor":"@backstage","versions":[{"version":"< 0.21.10","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-h53x-hjx6-25gr","source_modified_at":"2026-10-07T18:15:12.170259633Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"@backstage/plugin-kubernetes-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-kubernetes-backend"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.21.10"}]}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-h53x-hjx6-25gr","source_modified_at":"2026-10-07T18:01:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-kubernetes-backend"},"version":"0.21.10"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-h53x-hjx6-25gr","source_modified_at":"2026-10-07T18:15:12.170259633Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"@backstage/plugin-kubernetes-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-kubernetes-backend"},"version":"0.21.10"}],"cvss":3.5,"severity":"Low","kev":{"listed":false},"epss":{"probability":0.00263,"percentile":0.17126,"score_date":"2026-10-23"},"published_at":"2026-10-06T20:36:45.419Z","modified_at":"2026-10-09T01:49:45.471Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-h53x-hjx6-25gr","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T18:01:09Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106487","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-09T01:49:45.471Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-h53x-hjx6-25gr","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-07T18:15:12.170259633Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106487","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr","tags":["x_refsource_CONFIRM"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106487","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-h53x-hjx6-25gr","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-09T01:49:36.578700Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-09T01:49:45.471Z","content_hash":"9c6e525adf71c423db5cdb0190f963eec20cc5da87a6d39a117b7ee66f5ae09f"}}