Patch Forecast
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CVE-2026-106561 · GHSA-p795-mqf2-36mf

Backstage has a sensitive information disclosure in Kubernetes resource queries

Risk score
42/100
CVSS
5.0 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 0.21.9, the @backstage/plugin-kubernetes-backend package is affected by sensitive information disclosure in kubernetes resource queries. An authenticated user holding the standard Kubernetes resource read permission could retrieve sensitive values…
Affected
@backstage/plugin-kubernetes-backend (npm) < 0.21.9
Fix
Upgrade @backstage/plugin-kubernetes-backend to 0.21.9 or later.
Exploitation
No known exploitation

Story map

Story map: @backstage/plugin-kubernetes-backendTHE FLAWSTHE FIXCVE-2026-106561Backstage has a sensitiveinformation disclosure inKubernetes resource queriesCVSS 5.0 · EPSS 0%CVE-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%Upgrade…0.21.9 · 0.21.8 · 0.21.10or 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 weaknessInformation disclosure (CWE-200)197 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-2026-106561: Backstage has a sensitive information disclosure in Kubernetes resource queries (CVSS 5.0 · EPSS 0%)
  • 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%)

The fix

Upgrade @backstage/plugin-kubernetes-backend: 0.21.9 · 0.21.8 · 0.21.10 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 5.0 medium
  • On your watchlist: kubernetes, npm

Affected packages

PackageEcosystemVulnerableFixed in
@backstage/plugin-kubernetes-backendnpm< 0.21.90.21.9

References

Original description

Backstage is an open framework for building developer portals. Prior to 0.21.9, the @backstage/plugin-kubernetes-backend package is affected by sensitive information disclosure in kubernetes resource queries. An authenticated user holding the standard Kubernetes resource read permission could retrieve sensitive values that the Kubernetes plugin is designed to mask, potentially exposing credentials and other confidential material held in the connected clusters. Exposure is limited to resources that the Backstage service account is permitted to read and that match the targeted catalog entity's namespace and label selector. Deployments whose cluster credentials do not grant read access to these resources are unaffected. This issue is fixed in version 0.21.9.

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