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TI-2026-69055 Aliases CVE-2026-106459GHSA-g734-fhp4-7mfp

Improper input validation in Backstage Sentry scaffolder actions

Priority LOW 36CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

The @backstage/plugin-scaffolder-backend-module-sentry package is affected from 0.3.0 before 0.3.8. Improper input validation in its Sentry scaffolder actions lets the backend contact unintended destinations (CWE-918). An authenticated internal user who can run these actions may also disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. 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. This issue is fixed in version 0.3.8.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00212 11th percentileScored 2026-11-07
Fix Fixed backstage (backstage): 1.54.8plugin-scaffolder-backend-module-sentry (@backstage): 0.3.8+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagebackstage1.47.0 to before 1.54.81.54.8Patch availableCNA
backstageplugin-scaffolder-backend-module-sentry0.3.0 to before 0.3.80.3.8Patch availableCNA
—@backstage/plugin-scaffolder-backend-module-sentry (npm)0.3.0 to before 0.3.80.3.8Patch availableGHSA-g734-fhp4-7mfp
  • backstage Vendorbackstage Affected 1.47.0 to before 1.54.8 Fixed in 1.54.8 Patch available CNA
  • plugin-scaffolder-backend-module-sentry Vendorbackstage Affected 0.3.0 to before 0.3.8 Fixed in 0.3.8 Patch available CNA
  • @backstage/plugin-scaffolder-backend-module-sentry (npm) Vendor— Affected 0.3.0 to before 0.3.8 Fixed in 0.3.8 Patch available GHSA-g734-fhp4-7mfp

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-sentry:*:*:*:*:*:node.js:*:*0.3.0 to before 0.3.8Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*1.47.0 to before 1.54.8Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-sentry:*:*:*:*:*:node.js:*:* Versions 0.3.0 to before 0.3.8 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions 1.47.0 to before 1.54.8 Vulnerable ·backstage

Remediation

Upgrade @backstage/plugin-scaffolder-backend-module-sentry to version 0.3.8, which fixes this issue. The sources list no fixed version for backstage.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA backstage (backstage) Fixed in 1.54.8
  • Fix · CNA plugin-scaffolder-backend-module-sentry (@backstage) Fixed in 0.3.8
  • Fix · GHSA-g734-fhp4-7mfp @backstage/plugin-scaffolder-backend-module-sentry (npm) Fixed in 0.3.8 Advisory →

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106459
  2. 2026-10-07 CISA SSVC decision points changed
  3. 2026-10-07 Priority changed: MEDIUM → LOW
  4. 2026-10-07 Alias added: GHSA-g734-fhp4-7mfp
  5. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-g734-fhp4-7mfp
  6. 2026-10-07 CVSS score added · GHSA-g734-fhp4-7mfp
  7. 2026-10-07 Weakness changed · GHSA-g734-fhp4-7mfp
  8. 2026-10-07 6 new references · GHSA-g734-fhp4-7mfp

References

Patch 3

Advisory 2

Other 1

  • TI-2023-17988 Insecure sandbox in Backstage Scaffolder plugin CVSS 3.1CRITICAL 9.9
  • TI-2026-69075 Sensitive information exposure in Backstage Scaffolder CVSS 3.1CRITICAL 9.6
  • TI-2026-69061 Path traversal in Backstage Bitbucket pull-request scaffolder actions CVSS 3.1CRITICAL 9.9
  • TI-2026-60083 Backstage: Improper input validation in TechDocs MkDocs configuration CVSS 3.1HIGH 8.8
  • TI-2026-69165 Backstage TechDocs config flaw allows code execution CVSS 3.1HIGH 8.8
  • TI-2026-69083 Code injection via MkDocs theme configuration in Backstage TechDocs CVSS 3.1HIGH 8.8
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences