Vulnerability in @backstage/plugin-kubernetes-backend (CVE-2026-106487)
Summary
Vulnerability in @backstage/plugin-kubernetes-backend (CVE-2026-106487). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.21.10 or later.
Original description
The description as published by the source.
Impact
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.
Patches
Patched in @backstage/plugin-kubernetes-backend version 0.21.10
Workarounds
- Do not configure service account authentication through catalog-provided clusters; use the supported static configuration method when service account authentication is required.
- Restrict catalog ingestion so untrusted users cannot create or alter Kubernetes cluster Resource entities.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-106487 has been found in @backstage/plugin-kubernetes-backend.
Risk of unauthorized operations or information disclosure. CVSS score: 3.5/10.
What to do: upgrade @backstage/plugin-kubernetes-backend to 0.21.10 or later.
If unsure, ask your IT team or search "@backstage/plugin-kubernetes-backend CVE-2026-106487" on the vendor's site.
CVE-2026-106487 (@backstage/plugin-kubernetes-backend) — CWE-441 / CVSS v3 3.5
Attack vector: remote (network-reachable) / no user interaction
Patched: 0.21.10 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-441) exists in @backstage/plugin-kubernetes-backend.
Check the vendor advisory for the affected versions of @backstage/plugin-kubernetes-backend.
Severity: Low (CVSS 3.5/10). Risk of unauthorized operations or information disclosure.
Update to 0.21.10.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@backstage/plugin-kubernetes-backend' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@backstage/plugin-kubernetes-backend' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@backstage/plugin-kubernetes-backendを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @backstage/plugin-kubernetes-backend to 0.21.10ステージング環境で 0.21.10 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com