[ CVE-2026-106489 · Published 6 Oct 2026 ]
Backstage: Improper authorization enforcement for TechDocs static content
CVSS 6.5
EPSS <1%Fix available
[ Description ]Official description
Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper authorization enforcement for techdocs static content. 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. This issue is fixed in version 2.2.4.
[ Fixes ]Fixes and patches
- @backstage/plugin-techdocs-backend 2.2.4Fixed version · GitHub Advisories · npm package @backstage/plugin-techdocs-backend: upgrade to 2.2.4 or later (affected < 2.2.4)
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ Packages ]Affected open-source packages
- @backstage/plugin-techdocs-backend npmAffected < 2.2.4 · fixed in 2.2.4 · GHSA-rg9r-hr7g-5gc2