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TI-2026-69082 Aliases CVE-2026-106508GHSA-cm77-ch27-6w6v

File exposure through local TechDocs publisher in Backstage

Priority LOW 29CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

The @backstage/plugin-techdocs-node package in Backstage is affected before 1.15.4. When the local TechDocs publisher is used, the documentation serving endpoint can follow filesystem references outside the documentation tree (CWE-59), potentially exposing host files to authenticated users. Exploitation requires preconditions that do not arise through normal MkDocs operation. Cloud publishers (S3, GCS, Azure Blob Storage) are not affected.

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 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: 'local'), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00389 33rd percentileScored 2026-11-07
Fix Fixed backstage (backstage): 1.54.6plugin-techdocs-node (@backstage): 1.15.4+1 more product

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-techdocs-nodebefore 1.15.41.15.4Patch availableCNA
—@backstage/plugin-techdocs-node (npm)before 1.15.41.15.4Patch availableGHSA-cm77-ch27-6w6v
  • backstage Vendorbackstage Affected before 1.54.6 Fixed in 1.54.6 Patch available CNA
  • plugin-techdocs-node Vendorbackstage Affected before 1.15.4 Fixed in 1.15.4 Patch available CNA
  • @backstage/plugin-techdocs-node (npm) Vendor— Affected before 1.15.4 Fixed in 1.15.4 Patch available GHSA-cm77-ch27-6w6v

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*before 1.15.4Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.54.6Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:* Versions before 1.15.4 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 1.54.6 Vulnerable ·backstage

Remediation

Update @backstage/plugin-techdocs-node to version 1.15.4. The sources list no fixed version for backstage.

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-techdocs-node (@backstage) Fixed in 1.15.4
  • Fix · GHSA-cm77-ch27-6w6v @backstage/plugin-techdocs-node (npm) Fixed in 1.15.4 Advisory →

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106508
  2. 2026-10-07 Alias added: GHSA-cm77-ch27-6w6v
  3. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-cm77-ch27-6w6v
  4. 2026-10-07 CVSS score added · GHSA-cm77-ch27-6w6v
  5. 2026-10-07 Weakness changed · GHSA-cm77-ch27-6w6v
  6. 2026-10-07 5 new references · GHSA-cm77-ch27-6w6v
  7. 2026-10-09 CISA SSVC decision points changed
  8. 2026-10-09 CVSS score added · NVD

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