[ CVE-2026-106487 · Published 6 Oct 2026 ]
Backstage: Unsupported catalog cluster authentication mode in kubernetes backend
CVSS 5.0
EPSS <1%Fix available
[ Description ]Official 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.
[ Fixes ]Fixes and patches
- @backstage/plugin-kubernetes-backend 0.21.10Fixed version · GitHub Advisories · npm package @backstage/plugin-kubernetes-backend: upgrade to 0.21.10 or later (affected < 0.21.10)
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ Packages ]Affected open-source packages
- @backstage/plugin-kubernetes-backend npmAffected < 0.21.10 · fixed in 0.21.10 · GHSA-h53x-hjx6-25gr