CVE-2026-106563
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Linuxfoundation Backstage
PublishedOct 7, 2026
First seenOct 7, 2026
How to fix
Update
- linuxfoundation backstage1.54.1 or later
- linuxfoundation backstage\/plugin-kubernetes-backend0.21.8 or later
- @backstage/plugin-kubernetes-backend0.21.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation backstage | v < 1.54.1 | 1.54.1 |
| linuxfoundation backstage\/plugin-kubernetes-backend | v < 0.21.8 | 0.21.8 |
| @backstage/plugin-kubernetes-backendnpm | v < 0.21.8 | 0.21.8 |
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