{"schema_version":"1.9.0","id":"GHSA-h53x-hjx6-25gr","published":"2026-10-07T18:01:08Z","modified":"2026-10-07T18:15:12.170259633Z","aliases":["CVE-2026-106487"],"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.","affected":[{"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"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h53x-hjx6-25gr/GHSA-h53x-hjx6-25gr.json"}}],"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106487"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"}],"database_specific":{"cwe_ids":["CWE-441"],"github_reviewed":true,"github_reviewed_at":"2026-10-07T18:01:08Z","nvd_published_at":"2026-10-06T21:17:17Z","severity":"LOW"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N"}]}