{"id":"CVE-2026-106487","aliases":["GHSA-h53x-hjx6-25gr"],"url":"https://o3.security/vulnerability/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.","published":"2026-10-06T20:36:45.419Z","modified":"2026-10-21T02:54:35.199129447Z","cvss":{"score":3.5,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"@backstage/plugin-kubernetes-backend","fixedVersion":"0.21.10"}],"fix":{"url":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946","label":"backstage/backstage@c14f8be"},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106487.json"},{"type":"ADVISORY","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":"FIX","url":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:54:35.199129447Z"}}