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GHSA-r9ph-3637-55px

Backstage: Improper entity validation in deprecated Kubernetes services endpoint

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-106563

Packages

EcosystemPackageAffectedFixed in
npm @backstage/plugin-kubernetes-backend < 0.21.8 0.21.8

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact An authenticated user with Kubernetes read permissions could access Kubernetes workload data beyond their intended scope by supplying crafted entity data to the deprecated services endpoint. The exposure is limited to read-only access to Kubernetes object metadata across configured clusters. ### Patches Patched in `@backstage/plugin-kubernetes-backend` version 0.21.8. ### Workarounds - Disable the deprecated `/services/:serviceId` route by deploying a custom Kubernetes router that omits it. - Restrict access to the `kubernetes.resources.read` permission to limit the set of users who can reach the endpoint.

References

External links from the advisory. They lead to third-party sites.