要点
- CVE-2026-106487 は backstage (linuxfoundation), backstage/plugin-kubernetes-backend (linuxfoundation), @backstage/plugin-kubernetes-backend に影響する深刻度「中」 (CVSS 5.0) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.26%（全脆弱性の 18.1% より高い）。
- 対処：1.54.6, 0.21.10 以降に更新してください。
概要
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.
NVD の説明
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.
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