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TI-2026-69077 Aliases CVE-2026-106503GHSA-hmp2-4m7g-22cv

Authorization bypass in Backstage Scaffolder action inputs

Priority LOW 38CWE-178Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 1 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-284.

Summary

The backstage product is affected from 1.50.0-next.0 before 1.50.5, from 1.51.0-next.0 before 1.54.6 and before 1.49.6. The @backstage/plugin-scaffolder-backend package is affected before 3.3.1, from 3.4.0 before 3.4.1, from 4.0.0 before 4.0.3 and from 4.0.4 before 4.1.0. Improper handling of case sensitivity (CWE-178) lets an authenticated user with access to affected Scaffolder templates bypass configured action restrictions. Depending on integration credentials, this can grant unauthorized access to repositories and related source-control resources.

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 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00492 42nd percentileScored 2026-11-07
Fix Partial backstage (backstage): 1.49.6, 1.50.5, 1.54.6plugin-scaffolder-backend (@backstage): 3.3.1, 3.4.1, 4.0.3 +1+1 more productRed Hat: 1 advisoryRed Hat: 1 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 1.49.6; 1.50.0-next.0 to before 1.50.5; 1.51.0-next.0 to before 1.54.61.49.6, 1.50.5, 1.54.6Patch availableCNA
backstageplugin-scaffolder-backendbefore 3.3.1; 3.4.0 to before 3.4.1; 4.0.0 to before 4.0.3; 4.0.4 to before 4.1.03.3.1, 3.4.1, 4.0.3, 4.1.0Patch availableCNA
—@backstage/plugin-scaffolder-backend (npm)before 3.3.13.3.1Patch availableGHSA-hmp2-4m7g-22cv
—@backstage/plugin-scaffolder-backend (npm)3.4.0 to before 3.4.13.4.1Patch availableGHSA-hmp2-4m7g-22cv
—@backstage/plugin-scaffolder-backend (npm)4.0.0 to before 4.0.34.0.3Patch availableGHSA-hmp2-4m7g-22cv
—@backstage/plugin-scaffolder-backend (npm)4.0.4 to before 4.1.04.1.0Patch availableGHSA-hmp2-4m7g-22cv
  • backstage Vendorbackstage Affected before 1.49.6; 1.50.0-next.0 to before 1.50.5; 1.51.0-next.0 to before 1.54.6 Fixed in 1.49.6, 1.50.5, 1.54.6 Patch available CNA
  • plugin-scaffolder-backend Vendorbackstage Affected before 3.3.1; 3.4.0 to before 3.4.1; 4.0.0 to before 4.0.3; 4.0.4 to before 4.1.0 Fixed in 3.3.1, 3.4.1, 4.0.3, 4.1.0 Patch available CNA
  • @backstage/plugin-scaffolder-backend (npm) Vendor— Affected before 3.3.1 Fixed in 3.3.1 Patch available GHSA-hmp2-4m7g-22cv
  • @backstage/plugin-scaffolder-backend (npm) Vendor— Affected 3.4.0 to before 3.4.1 Fixed in 3.4.1 Patch available GHSA-hmp2-4m7g-22cv
  • @backstage/plugin-scaffolder-backend (npm) Vendor— Affected 4.0.0 to before 4.0.3 Fixed in 4.0.3 Patch available GHSA-hmp2-4m7g-22cv
  • @backstage/plugin-scaffolder-backend (npm) Vendor— Affected 4.0.4 to before 4.1.0 Fixed in 4.1.0 Patch available GHSA-hmp2-4m7g-22cv

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*before 3.3.1; 3.4.0 to before 3.4.1; 4.0.0 to before 4.0.3; 4.0.4 to before 4.1.0Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.49.6; 1.50.0 to before 1.50.5; 1.51.0 to before 1.54.6Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:* Versions before 3.3.1; 3.4.0 to before 3.4.1; 4.0.0 to before 4.0.3; 4.0.4 to before 4.1.0 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 1.49.6; 1.50.0 to before 1.50.5; 1.51.0 to before 1.54.6 Vulnerable ·backstage

Remediation

Upgrade @backstage/plugin-scaffolder-backend to 3.3.1, 3.4.1, 4.0.3 or 4.1.0. Red Hat fixes Ansible Automation Platform 2.2 through RHSA-2026:86675. The sources list no fixed version for backstage. Red Hat lists no available plan for Red Hat Developer Hub 1 or Self-service automation portal 2.

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

  • Fix · CNA backstage (backstage) Fixed in 1.49.6, 1.50.5, 1.54.6
  • Fix · CNA plugin-scaffolder-backend (@backstage) Fixed in 3.3.1, 3.4.1, 4.0.3, 4.1.0
  • Fix · GHSA-hmp2-4m7g-22cv @backstage/plugin-scaffolder-backend (npm) Fixed in 3.3.1 Advisory →
  • Fix · GHSA-hmp2-4m7g-22cv @backstage/plugin-scaffolder-backend (npm) Fixed in 3.4.1 Advisory →
  • Fix · GHSA-hmp2-4m7g-22cv @backstage/plugin-scaffolder-backend (npm) Fixed in 4.0.3 Advisory →
  • Fix · GHSA-hmp2-4m7g-22cv @backstage/plugin-scaffolder-backend (npm) Fixed in 4.1.0 Advisory →

Red Hat 1 advisory

  • RHSA-2026:86675 Released 2026-10-21 · Red Hat rating Important
    Ansible plug-ins for Red Hat Developer Hub Product Release Update
    • Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/automation-portal

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Developer Hub 1AffectedNo fix yet
Self-service automation portal 2AffectedNo fix yet
Red Hat Ansible Automation Platform 2.2Fixed RHSA-2026:86675

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106503
  2. 2026-10-07 Alias added: GHSA-hmp2-4m7g-22cv
  3. 2026-10-07 Fix available: npm/@backstage/[email protected], npm/@backstage/[email protected], npm/@backstage/[email protected] +1 · GHSA-hmp2-4m7g-22cv
  4. 2026-10-07 CVSS score added · GHSA-hmp2-4m7g-22cv
  5. 2026-10-07 Weakness changed · GHSA-hmp2-4m7g-22cv
  6. 2026-10-07 9 new references · GHSA-hmp2-4m7g-22cv
  7. 2026-10-07 Priority changed: MEDIUM → LOW
  8. 2026-10-08 Affected versions changed · Red Hat
  9. 2026-10-08 CVSS score added · Red Hat
  10. 2026-10-09 CISA SSVC decision points changed
  11. 2026-10-21 Fix available: RHSA-2026:86675 · Red Hat
  12. 2026-10-21 Fix available: Red Hat Ansible Automation Platform 2.2 · Red Hat
  13. 2026-10-27 Affected versions changed · Red Hat

References

Patch 6

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