Vulnerability in @backstage/backend-defaults (CVE-2026-106495)
Summary
Vulnerability in @backstage/backend-defaults (CVE-2026-106495). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.17.8 or later.
Original description
The description as published by the source.
Impact
An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced.
Patches
Patched in @backstage/backend-defaults version 0.17.8
Workarounds
Limit access to action invocation endpoints to trusted service callers until upgrading.
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-2026-106495 has been found in @backstage/backend-defaults.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade @backstage/backend-defaults to 0.17.8 or later.
If unsure, ask your IT team or search "@backstage/backend-defaults CVE-2026-106495" on the vendor's site.
CVE-2026-106495 (@backstage/backend-defaults) — CWE-284 / CVSS v3 4.3
Attack vector: remote (network-reachable) / no user interaction
Patched: 0.17.8 — apply immediately
Workaround: Limit access to action invocation endpoints to trusted service callers until upgrading.
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-284) exists in @backstage/backend-defaults.
Check the vendor advisory for the affected versions of @backstage/backend-defaults.
Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.
Update to 0.17.8.
Workaround: Limit access to action invocation endpoints to trusted service callers until upgrading.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@backstage/backend-defaults' . 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
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1Identify exposure identify
grep -r '@backstage/backend-defaults' . | 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/backend-defaultsを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
Limit access to action invocation endpoints to trusted service callers until upgrading.パッチが適用されるまでの応急処置として、Limit access to action invocation endpoints to trusted service callers until upgrading. を実施。回避策の副作用 (機能低下) を確認した上で。
-
3Apply patch patch
Upgrade @backstage/backend-defaults to 0.17.8ステージング環境で 0.17.8 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。
-
4Post-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