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TI-2026-69072 Aliases CVE-2026-106498GHSA-qgvj-qcf8-xq73

Improper URL validation in Backstage catalog entity placeholders

Priority LOW 33CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass, 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-863, CWE-918 and the CVSS impact.

Summary

The @backstage/plugin-catalog-backend package is affected before 3.5.1, from 3.6.0 before 3.6.2, from 3.7.0 before 3.7.2, from 3.8.0 before 3.8.2 and from 3.9.0 before 3.9.1. Improper URL validation in catalog entity placeholder resolution (CWE-918) lets an authenticated Backstage user craft an entity whose placeholder directives reference resources outside the entity's source repository. Under certain configurations, this can expose data the user is not meant to access.

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 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00307 23rd percentileScored 2026-11-07
Fix Partial backstage (backstage): 1.49.6, 1.50.5, 1.51.3 +2plugin-catalog-backend (@backstage): 3.5.1, 3.6.2, 3.7.2 +2+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 1.49.6; 1.50.0-next.0 to before 1.50.5; 1.51.0-next.0 to before 1.51.3; 1.52.0-next.0 to before 1.53.2; 1.54.0-next.0 to before 1.54.61.49.6, 1.50.5, 1.51.3, 1.53.2, 1.54.6Patch availableCNA
backstageplugin-catalog-backendbefore 3.5.1; 3.6.0 to before 3.6.2; 3.7.0 to before 3.7.2; 3.8.0 to before 3.8.2; 3.9.0 to before 3.9.13.5.1, 3.6.2, 3.7.2, 3.8.2, 3.9.1Patch availableCNA
—@backstage/plugin-catalog-backend (npm)before 3.9.13.9.1Patch availableGHSA-qgvj-qcf8-xq73
  • backstage Vendorbackstage Affected before 1.49.6; 1.50.0-next.0 to before 1.50.5; 1.51.0-next.0 to before 1.51.3; 1.52.0-next.0 to before 1.53.2; 1.54.0-next.0 to before 1.54.6 Fixed in 1.49.6, 1.50.5, 1.51.3, 1.53.2, 1.54.6 Patch available CNA
  • plugin-catalog-backend Vendorbackstage Affected before 3.5.1; 3.6.0 to before 3.6.2; 3.7.0 to before 3.7.2; 3.8.0 to before 3.8.2; 3.9.0 to before 3.9.1 Fixed in 3.5.1, 3.6.2, 3.7.2, 3.8.2, 3.9.1 Patch available CNA
  • @backstage/plugin-catalog-backend (npm) Vendor— Affected before 3.9.1 Fixed in 3.9.1 Patch available GHSA-qgvj-qcf8-xq73

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage_plugin-catalog-backend:*:*:*:*:*:node.js:*:*before 3.5.1; 3.6.0 to before 3.6.2; 3.7.0 to before 3.7.2; 3.8.0 to before 3.8.2; 3.9.0 to before 3.9.1Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.49.6; 1.50.0 to before 1.50.5; 1.51.0 to before 1.51.3; 1.52.0 to before 1.53.2; 1.54.0 to before 1.54.6Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage_plugin-catalog-backend:*:*:*:*:*:node.js:*:* Versions before 3.5.1; 3.6.0 to before 3.6.2; 3.7.0 to before 3.7.2; 3.8.0 to before 3.8.2; 3.9.0 to before 3.9.1 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 1.51.3; 1.52.0 to before 1.53.2; 1.54.0 to before 1.54.6 Vulnerable ·backstage

Remediation

Update @backstage/plugin-catalog-backend to 3.5.1, 3.6.2, 3.7.2, 3.8.2 or 3.9.1, matching your release line. 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 1.49.6, 1.50.5, 1.51.3, 1.53.2, 1.54.6
  • Fix · CNA plugin-catalog-backend (@backstage) Fixed in 3.5.1, 3.6.2, 3.7.2, 3.8.2, 3.9.1
  • Fix · GHSA-qgvj-qcf8-xq73 @backstage/plugin-catalog-backend (npm) Fixed in 3.9.1 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
Self-service automation portal 2AffectedNo fix yet

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106498
  2. 2026-10-07 Affected versions changed · Red Hat
  3. 2026-10-07 CVSS score added · Red Hat
  4. 2026-10-07 Alias added: GHSA-qgvj-qcf8-xq73
  5. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-qgvj-qcf8-xq73
  6. 2026-10-07 CVSS score added · GHSA-qgvj-qcf8-xq73
  7. 2026-10-07 Weakness changed · GHSA-qgvj-qcf8-xq73
  8. 2026-10-07 13 new references · GHSA-qgvj-qcf8-xq73
  9. 2026-10-07 Priority changed: MEDIUM → LOW
  10. 2026-10-09 CISA SSVC decision points changed
  11. 2026-10-27 Affected versions changed · Red Hat

References

Patch 10

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