CVE-2026-106487
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.
How to fix
- linuxfoundation backstage1.54.6 or later
- linuxfoundation backstage\/plugin-kubernetes-backend0.21.10 or later
- @backstage/plugin-kubernetes-backend0.21.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation backstage | v < 1.54.6 | 1.54.6 |
| linuxfoundation backstage\/plugin-kubernetes-backend | v < 0.21.10 | 0.21.10 |
| @backstage/plugin-kubernetes-backendnpm | v < 0.21.10 | 0.21.10 |
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