CVE-2026-106489: Backstage: Improper authorization enforcement for TechDocs static content

October 7, 2026

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.

References

github.com/advisories/GHSA-rg9r-hr7g-5gc2
github.com/backstage/backstage/commit/bf6bbf7326ada7d96d7b2c4ebc4a71546106f311
github.com/backstage/backstage/releases/tag/v1.54.6
github.com/backstage/backstage/security/advisories/GHSA-rg9r-hr7g-5gc2
nvd.nist.gov/vuln/detail/CVE-2026-106489

Code Behaviors & Features

Detect and mitigate CVE-2026-106489 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →