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TI-2026-69165 Aliases CVE-2026-106558GHSA-qmw3-745m-w99g

Backstage TechDocs config flaw allows code execution

Priority MEDIUM 40CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
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-502.

Summary

The @backstage/plugin-techdocs-node package improperly validates mapping-style markdown_extensions configuration, a deserialization flaw (CWE-502). An authenticated attacker who can register or influence an SCM-backed documentation source can bypass TechDocs sanitization, get Python objects imported and instantiated, and run arbitrary code. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network 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 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00469 40th percentileScored 2026-11-07
Fix Partial backstage (backstage): 1.50.7, 1.54.9, 1.55.2plugin-techdocs-node (@backstage): 1.14.8, 1.15.6, 2.0.1+1 more productRed Hat: 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 1.50.7; 1.51.0-next.0 to before 1.54.9; 1.55.0-next.0 to before 1.55.21.50.7, 1.54.9, 1.55.2Patch availableCNA
backstageplugin-techdocs-nodebefore 1.14.8; 1.15.0 to before 1.15.6; 2.0.0 to before 2.0.11.14.8, 1.15.6, 2.0.1Patch availableCNA
—@backstage/plugin-techdocs-node (npm)before 1.15.41.15.4Patch availableGHSA-qmw3-745m-w99g
  • backstage Vendorbackstage Affected before 1.50.7; 1.51.0-next.0 to before 1.54.9; 1.55.0-next.0 to before 1.55.2 Fixed in 1.50.7, 1.54.9, 1.55.2 Patch available CNA
  • plugin-techdocs-node Vendorbackstage Affected before 1.14.8; 1.15.0 to before 1.15.6; 2.0.0 to before 2.0.1 Fixed in 1.14.8, 1.15.6, 2.0.1 Patch available CNA
  • @backstage/plugin-techdocs-node (npm) Vendor— Affected before 1.15.4 Fixed in 1.15.4 Patch available GHSA-qmw3-745m-w99g

CPE configurations NVD · 11

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*before 1.14.8; 1.15.0 to before 1.15.6; 2.0.0 to before 2.0.1Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.50.7; 1.51.1 to before 1.54.8; 1.55.1 to before 1.55.2Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.51.0:-:*:*:*:*:*:*1.51.0Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next0:*:*:*:*:*:*1.51.0 next0Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next1:*:*:*:*:*:*1.51.0 next1Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next2:*:*:*:*:*:*1.51.0 next2Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next3:*:*:*:*:*:*1.51.0 next3Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.55.0:-:*:*:*:*:*:*1.55.0Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.55.0:next0:*:*:*:*:*:*1.55.0 next0Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:1.55.0:next1:*:*:*:*:*:*1.55.0 next1Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:* Versions before 1.14.8; 1.15.0 to before 1.15.6; 2.0.0 to before 2.0.1 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 1.50.7; 1.51.1 to before 1.54.8; 1.55.1 to before 1.55.2 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.51.0:-:*:*:*:*:*:* Versions 1.51.0 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.51.0:next0:*:*:*:*:*:* Versions 1.51.0 next0 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.51.0:next1:*:*:*:*:*:* Versions 1.51.0 next1 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.51.0:next2:*:*:*:*:*:* Versions 1.51.0 next2 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.51.0:next3:*:*:*:*:*:* Versions 1.51.0 next3 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.55.0:-:*:*:*:*:*:* Versions 1.55.0 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.55.0:next0:*:*:*:*:*:* Versions 1.55.0 next0 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:1.55.0:next1:*:*:*:*:*:* Versions 1.55.0 next1 Vulnerable ·backstage
Show 1 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage:1.55.0:next2:*:*:*:*:*:*1.55.0 next2Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage:1.55.0:next2:*:*:*:*:*:* Versions 1.55.0 next2 Vulnerable ·backstage

Remediation

Upgrade @backstage/plugin-techdocs-node to 1.14.8, 1.15.6, or 2.0.1. The sources list no fixed version for backstage. Red Hat lists no plan available 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 1.50.7, 1.54.9, 1.55.2
  • Fix · CNA plugin-techdocs-node (@backstage) Fixed in 1.14.8, 1.15.6, 2.0.1
  • Fix · GHSA-qmw3-745m-w99g @backstage/plugin-techdocs-node (npm) Fixed in 1.15.4 Advisory →

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

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106558
  2. 2026-10-07 Alias added: GHSA-qmw3-745m-w99g
  3. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-qmw3-745m-w99g
  4. 2026-10-07 CVSS score added · GHSA-qmw3-745m-w99g
  5. 2026-10-07 Weakness changed · GHSA-qmw3-745m-w99g
  6. 2026-10-07 9 new references · GHSA-qmw3-745m-w99g
  7. 2026-10-09 Priority changed: MEDIUM → LOW
  8. 2026-10-10 CISA SSVC decision points changed
  9. 2026-10-10 Priority changed: LOW → MEDIUM
  10. 2026-10-21 Affected versions changed · Red Hat
  11. 2026-10-21 CVSS score added · Red Hat
  12. 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-2026-69083 Code injection via MkDocs theme configuration in Backstage TechDocs CVSS 3.1HIGH 8.8
  • TI-2026-69074 Race condition in Backstage scaffolder backend task handling CVSS 3.1HIGH 8.5
See all 52 →

Sources

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