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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-106563

Backstage: Improper entity validation in deprecated Kubernetes services endpoint

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

backstage backstage

  • < 1.54.1affected

@backstage plugin-kubernetes-backend

  • < 0.21.8affected

References