Disclosure summary
### Impact 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. ### Patches Patched in `@backstage/plugin-kubernetes-backend` version `0.21.10` ### Workarounds - Do not configure service account authentication through catalog-provided clusters; use the supported static configuration method when service account authentication is required. - Restrict catalog ingestion so untrusted users cannot create or alter Kubernetes cluster Resource entities.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
GitHub Reviewed Security Advisories · GHSA-h53x-hjx6-25gr
Open original source · Updated Oct 07, 2026
Backstage: Unsupported catalog cluster authentication mode in kubernetes backend
Source severity: LOW / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | @backstage/plugin-kubernetes-backend | < 0.21.10 | 0.21.10 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Reviewed advisory
PUBLISHED 2026-10-07T14:01:08-04:00
MODIFIED 2026-10-07T14:01:09-04:00
INGESTED 2026-10-08T12:30:38-04:00