Patch Forecast
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CVE-2026-106563 · GHSA-r9ph-3637-55px

Backstage: Improper entity validation in deprecated Kubernetes services endpoint

Risk score
52/100
CVSS
6.5 v3.1
Exploit chance (30 days)
0.2%
Published
7 Oct 2026

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What to know

What it is
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 thei…
Affected
@backstage/plugin-kubernetes-backend (npm) < 0.21.8
Fix
Upgrade @backstage/plugin-kubernetes-backend to 0.21.8 or later.
Exploitation
No known exploitation

Story map

Story map: @backstage/plugin-kubernetes-backendTHE FLAWSTHE FIXCVE-2026-106563Backstage: Improper entityvalidation in deprecatedKubernetes services endpointCVSS 6.5 · EPSS 0%CVE-2026-106487Backstage: Unsupportedcatalog cluster authenticationmode in kubernetes backendCVSS 5.0 · EPSS 0%CVE-2026-106561Backstage has a sensitiveinformation disclosure inKubernetes resource queriesCVSS 5.0 · EPSS 0%Upgrade…0.21.8 · 0.21.10 · 0.21.9or later on your release lineWho is exposed@backstage/plugin-kubernetes-backend (npm) < 0.21.8YELLOW · PLAN IT IN@backstage/plugin-kubernetes-ba…Backstage is an open frameworkfor building developer portals.Prior to 0.21.8, the@backstage/plugin-kubernetes-backend package is affected byimproper entity validation indeprecated kubernetes services…Where it standsNo known exploitationCONNECTS TOSame weaknessMissing authorisation (CWE-862)399 other warnings in 30 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

@backstage/plugin-kubernetes-backend: Yellow, plan it in. 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 thei…

The flaws

  • CVE-2026-106563: Backstage: Improper entity validation in deprecated Kubernetes services endpoint (CVSS 6.5 · EPSS 0%)
  • CVE-2026-106487: Backstage: Unsupported catalog cluster authentication mode in kubernetes backend (CVSS 5.0 · EPSS 0%)
  • CVE-2026-106561: Backstage has a sensitive information disclosure in Kubernetes resource queries (CVSS 5.0 · EPSS 0%)

The fix

Upgrade @backstage/plugin-kubernetes-backend: 0.21.8 · 0.21.10 · 0.21.9 or later on your release line

Who is exposed: @backstage/plugin-kubernetes-backend (npm) < 0.21.8

Where it stands

  • No known exploitation

Connects to

Why it is Yellow

  • CVSS 6.5 medium
  • On your watchlist: kubernetes, npm

Affected packages

PackageEcosystemVulnerableFixed in
@backstage/plugin-kubernetes-backendnpm< 0.21.80.21.8

References

Original 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.

Last activity 7 Oct 2026. Patch Forecast updates every hour.