GitHub Advisoryadvisory · npm

GHSA-cm77-ch27-6w6v Backstage has potential file exposure through local TechDocs publisher

MEDIUM Published 2026-10-07 Modified 2026-10-07 Official page ↗
Aliases
CVE-2026-106508
Ecosystem
npm
Packages
@backstage/plugin-techdocs-node
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-22, CWE-59
Reviewed
2026-10-07

Affected packages

• npm @backstage/plugin-techdocs-node: < 1.15.4 → fixed in 1.15.4

Description

Impact 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. Patches Patched in `@backstage/plugin-techdocs-node` version `1.15.4` Workarounds If you cannot upgrade immediately, consider switching to an external store for published TechDocs content (e.g. `awsS3`, `googleGcs`, or `azureBlobStorage` publishers)

Related

Alias · CVE (1)

  • CVE-2026-106508 Backstage is an open framework for building developer portals. vulnerability

Weakness · CWE (2)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness
  • CWE-59 Improper Link Resolution Before File Access weakness

References