Plugin techdocs backend: Backstage: Improper authorization enforcement for TechDocs static content (CVE-2026-106489)
Description
An authorization flaw in the Backstage TechDocs backend plugin allows an authenticated user with access to one documentation site to access documentation belonging to other entities. This issue only affects deployments using the external TechDocs builder with external storage providers (such as S3 or GCS) and the permission framework enabled. Deployments without the permission framework or those serving TechDocs from local storage are not affected. The vulnerability is patched in version 2.2.4 of the @backstage/plugin-techdocs-backend package.
CVSS v3.1
Score 6.5medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-106489 describes an improper authorization enforcement vulnerability in the Backstage TechDocs backend plugin. Authenticated users with access to one TechDocs site could craft URLs to read documentation from other entities when using the external TechDocs builder with external storage providers and the permission framework enabled. This flaw does not affect instances without the permission framework or those serving content locally. The issue is fixed in version 2.2.4 of the plugin.
Potential Impact
The vulnerability allows unauthorized read access to TechDocs documentation belonging to other entities within the same deployment, potentially exposing sensitive documentation. The impact is limited to deployments using external storage providers with the permission framework enabled. Confidentiality is affected (high impact), but integrity and availability are not impacted.
Mitigation Recommendations
Upgrade to @backstage/plugin-techdocs-backend version 2.2.4 or later to remediate this vulnerability. Deployments serving TechDocs content from local storage are not affected and require no action. No other workarounds are available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-rg9r-hr7g-5gc2
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-106489"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6ac6bfff2cdf04f6568291b0
Added to database: 10/07/2026, 21:56:15 UTC
Last enriched: 10/07/2026, 22:14:40 UTC
Last updated: 10/07/2026, 22:14:40 UTC
Views: 5
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