Information Disclosure in @backstage/plugin-scaffolder-backend-module-sentry (CVE-2026-106459)
Summary
Vulnerability in @backstage/plugin-scaffolder-backend-module-sentry (CVE-2026-106459). Confidential information can be exposed externally. Exploitable via apiBaseUrl. Mitigation: upgrade to 0.3.8 or later.
Original description
The description as published by the source.
Impact
An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token.
Patches
Upgrade @backstage/plugin-scaffolder-backend-module-sentry to version 0.3.8 or later. The fixed package is available in Backstage v1.54.8 and Backstage v1.55.0.
The update removes custom action-level apiBaseUrl values. Move any such value to scaffolder.sentry.apiBaseUrl before upgrading.
Workarounds
- Disable the affected actions until the patched package is deployed.
- Restrict
scaffolder.action.executepermission for the affected Sentry actions to trusted users and templates.
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-2026-106459 has been found in @backstage/plugin-scaffolder-backend-module-sentry.
Attackers can target a specific entry point like apiBaseUrl over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 8.5/10.
What to do: upgrade @backstage/plugin-scaffolder-backend-module-sentry to 0.3.8 or later.
If unsure, ask your IT team or search "@backstage/plugin-scaffolder-backend-module-sentry CVE-2026-106459" on the vendor's site.
CVE-2026-106459 (@backstage/plugin-scaffolder-backend-module-sentry) — CWE-200 / CVSS v3 8.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: apiBaseUrl / scaffolder.sentry.apiBaseUrl / scaffolder.action.execute
Patched: 0.3.8 — 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.
Information disclosure (CWE-200) exists in @backstage/plugin-scaffolder-backend-module-sentry. Attackers reach the vulnerable code path via apiBaseUrl.
Check the vendor advisory for the affected versions of @backstage/plugin-scaffolder-backend-module-sentry. Attack surface: apiBaseUrl / scaffolder.sentry.apiBaseUrl / scaffolder.action.execute.
Severity: High (CVSS 8.5/10). Confidential information can be exposed externally.
Update to 0.3.8.
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-scaffolder-backend-module-sentry' . 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-scaffolder-backend-module-sentry' . | 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-scaffolder-backend-module-sentry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-scaffolder-backend-module-sentry to 0.3.8ステージング環境で 0.3.8 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。
-
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
- patch security-advisories@github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- web nvd.nist.gov
- web github.com