Patch Forecast
Yellow warning
Plan into this sprint.

CVE-2026-106487 · GHSA-h53x-hjx6-25gr

Backstage: Unsupported catalog cluster authentication mode in kubernetes backend

Risk score
43/100
CVSS
5.0 v3.1
Exploit chance (30 days)
0.3%
Published
6 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is
Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or mod…
Affected
@backstage/plugin-kubernetes-backend (npm) < 0.21.10
Fix
Upgrade @backstage/plugin-kubernetes-backend to 0.21.10 or later.
Exploitation
No known exploitation

Story map

Story map: @backstage/plugin-kubernetes-backendTHE FLAWSTHE FIXCVE-2026-106487Backstage: Unsupportedcatalog cluster authenticationmode in kubernetes backendCVSS 5.0 · EPSS 0%CVE-2026-106563Backstage: Improper entityvalidation in deprecatedKubernetes services endpointCVSS 6.5 · EPSS 0%CVE-2026-106561Backstage has a sensitiveinformation disclosure inKubernetes resource queriesCVSS 5.0 · EPSS 0%Upgrade…0.21.10 · 0.21.8 · 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 weaknessCWE-441 (CWE-441)32 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-2026-106487: Backstage: Unsupported catalog cluster authentication mode in kubernetes backend (CVSS 5.0 · EPSS 0%)
  • CVE-2026-106563: Backstage: Improper entity validation in deprecated Kubernetes services endpoint (CVSS 6.5 · 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: 0.21.10 · 0.21.8 · 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 5.0 medium
  • On your watchlist: kubernetes, npm

Affected packages

PackageEcosystemVulnerableFixed in
@backstage/plugin-kubernetes-backendnpm< 0.21.100.21.10

References

Original description

Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.

Last activity 6 Oct 2026. Patch Forecast updates every hour.