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TI-2026-69069 Aliases CVE-2026-106494GHSA-7649-wm97-w3j3

Improper input validation in Backstage cloud storage URL readers

Priority LOW 22CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

The @backstage/backend-defaults package before 0.17.8 in Backstage has improper input validation in its cloud storage URL readers. An attacker can craft object names that collide with protected files in the output directory (CWE-22). An attacker with write access to a cloud storage bucket used by Backstage can exploit this, and in certain deployment configurations this can lead to content injection.

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 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed in version 0.17.8.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Fix Partial backstage (backstage): 1.54.6backend-defaults (@backstage): 0.17.8+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
backstagebackend-defaultsbefore 0.17.80.17.8Patch availableCNA
—@backstage/backend-defaults (npm)before 0.17.80.17.8Patch availableGHSA-7649-wm97-w3j3
  • backstage Vendorbackstage Affected before 1.54.6 Fixed in 1.54.6 Patch available CNA
  • backend-defaults Vendorbackstage Affected before 0.17.8 Fixed in 0.17.8 Patch available CNA
  • @backstage/backend-defaults (npm) Vendor— Affected before 0.17.8 Fixed in 0.17.8 Patch available GHSA-7649-wm97-w3j3

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage\/backend_defaults:*:*:*:*:*:node.js:*:*before 0.17.8Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.54.6Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage\/backend_defaults:*:*:*:*:*:node.js:*:* Versions before 0.17.8 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 1.54.6 Vulnerable ·backstage

Remediation

Upgrade @backstage/backend-defaults to version 0.17.8, which fixes this issue. The sources list no fixed version for backstage. Red Hat lists no available plan for Red Hat Developer Hub 1 and Self-service automation portal 2.

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

  • Fix · CNA backstage (backstage) Fixed in 1.54.6
  • Fix · CNA backend-defaults (@backstage) Fixed in 0.17.8
  • Fix · GHSA-7649-wm97-w3j3 @backstage/backend-defaults (npm) Fixed in 0.17.8 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-2026-106494
  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-7649-wm97-w3j3
  6. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-7649-wm97-w3j3
  7. 2026-10-07 CVSS score added · GHSA-7649-wm97-w3j3
  8. 2026-10-07 Weakness changed · GHSA-7649-wm97-w3j3
  9. 2026-10-07 5 new references · GHSA-7649-wm97-w3j3
  10. 2026-10-23 CVSS score added · NVD
  11. 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