GitHub Advisoryadvisory · npm

GHSA-r9ph-3637-55px Backstage: Improper entity validation in deprecated Kubernetes services endpoint

MEDIUM Published 2026-10-07 Modified 2026-10-07 Official page ↗
Aliases
CVE-2026-106563
Ecosystem
npm
Packages
@backstage/plugin-kubernetes-backend
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-20, CWE-862
Reviewed
2026-10-07

Affected packages

• npm @backstage/plugin-kubernetes-backend: < 0.21.8 → fixed in 0.21.8

Description

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.

Related

Alias · CVE (1)

  • CVE-2026-106563 Backstage is an open framework for building developer portals. vulnerability

Weakness · CWE (2)

  • CWE-20 Improper Input Validation weakness
  • CWE-862 Missing Authorization weakness

References