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TI-2026-69073 Aliases CVE-2026-106499GHSA-mfvq-x7vr-rgqg

Secret-derived values exposed in Backstage scaffolder task logs

Priority LOW 22CWE-532Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-532.

Summary

The @backstage/plugin-scaffolder-backend package before 4.1.0 can expose secret-derived values in Scaffolder task logs. Secret-derived values used during template iteration are persisted in task logs (CWE-532). A template author who can create or modify Scaffolder templates can expose these values to users who can access the resulting task logs, in deployments that configure sensitive scaffolder.defaultEnvironment.secrets.

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. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0027 19th percentileScored 2026-11-07
Fix Partial backstage (backstage): 1.54.6plugin-scaffolder-backend (@backstage): 4.1.0+1 more productRed Hat: 2 without a fix

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
backstagebackstagebefore 1.54.61.54.6Patch availableCNA
backstageplugin-scaffolder-backendbefore 4.1.04.1.0Patch availableCNA
—@backstage/plugin-scaffolder-backend (npm)before 4.1.04.1.0Patch availableGHSA-mfvq-x7vr-rgqg
  • backstage Vendorbackstage Affected before 1.54.6 Fixed in 1.54.6 Patch available CNA
  • plugin-scaffolder-backend Vendorbackstage Affected before 4.1.0 Fixed in 4.1.0 Patch available CNA
  • @backstage/plugin-scaffolder-backend (npm) Vendor— Affected before 4.1.0 Fixed in 4.1.0 Patch available GHSA-mfvq-x7vr-rgqg

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*before 4.1.0Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.54.6Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:* Versions before 4.1.0 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 1.54.6 Vulnerable ·backstage

Remediation

Update @backstage/plugin-scaffolder-backend to version 4.1.0, which fixes the issue. The sources list no fixed version for backstage. Red Hat lists Red Hat Developer Hub 1 and Self-service automation portal 2 as affected without a fix, with no plan available.

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

  • Fix · CNA backstage (backstage) Fixed in 1.54.6
  • Fix · CNA plugin-scaffolder-backend (@backstage) Fixed in 4.1.0
  • Fix · GHSA-mfvq-x7vr-rgqg @backstage/plugin-scaffolder-backend (npm) Fixed in 4.1.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Developer Hub 1AffectedNo fix yet: Fix deferred
Self-service automation portal 2AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106499
  2. 2026-10-07 Affected versions changed · Red Hat
  3. 2026-10-07 CVSS score added · Red Hat
  4. 2026-10-07 CISA SSVC decision points changed
  5. 2026-10-07 Alias added: GHSA-mfvq-x7vr-rgqg
  6. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-mfvq-x7vr-rgqg
  7. 2026-10-07 CVSS score added · GHSA-mfvq-x7vr-rgqg
  8. 2026-10-07 Weakness changed · GHSA-mfvq-x7vr-rgqg
  9. 2026-10-07 5 new references · GHSA-mfvq-x7vr-rgqg
  10. 2026-10-27 Affected versions changed · Red Hat

References

Patch 2

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