Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M
CVE-2026-106489Backstage: Improper authorization enforcement for TechDocs static content
Medium 6.5
In plain English
A medium-severity path traversal in backstage from backstage. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @backstage/plugin-techdocs-backend | 2.2.4 | GHSA-rg9r-hr7g-5gc2 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| backstage | backstage | < 1.54.6 |
| @backstage | plugin-techdocs-backend | < 2.2.4 |
Weakness: CWE-22, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N