[ CVE-2026-106563 · Published 7 Oct 2026 ]
Backstage: Improper entity validation in deprecated Kubernetes services endpoint
CVSS 6.5
EPSS <1%Fix available
[ Description ]Official description
Backstage is an open framework for building developer portals. Prior to 0.21.8, the @backstage/plugin-kubernetes-backend package is affected by improper entity validation in deprecated kubernetes services endpoint. 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. This issue is fixed in version 0.21.8.
[ Fixes ]Fixes and patches
- @backstage/plugin-kubernetes-backend 0.21.8Fixed version · GitHub Advisories · npm package @backstage/plugin-kubernetes-backend: upgrade to 0.21.8 or later (affected < 0.21.8)
- 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 < 0.21.8 · fixed in 0.21.8 · GHSA-r9ph-3637-55px