GitHub Advisoryadvisory · npm

GHSA-rg9r-hr7g-5gc2 Backstage: Improper authorization enforcement for TechDocs static content

MEDIUM Published 2026-10-07 Modified 2026-10-07 Official page ↗
Aliases
CVE-2026-106489
Ecosystem
npm
Packages
@backstage/plugin-techdocs-backend
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-22, CWE-862
Reviewed
2026-10-07

Affected packages

• npm @backstage/plugin-techdocs-backend: < 2.2.4 → fixed in 2.2.4

Description

Impact An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design. Patches Patched in `@backstage/plugin-techdocs-backend` version `2.2.4` Workarounds • None other than upgrading. Deployments that serve TechDocs from local storage are not affected.

Related

Alias · CVE (1)

  • CVE-2026-106489 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-862 Missing Authorization weakness

References