Plugin techdocs backend: Backstage: Improper input validation in TechDocs static content requests (CVE-2026-106490)
Description
An improper input validation vulnerability in the Backstage TechDocs backend plugin allows authenticated users to read restricted TechDocs content when using the Azure Blob Storage provider with entity-level permissions enabled. Deployments that disable the default backend authentication policy may have broader exposure. The issue is patched in version 2.2.4 of the plugin.
CVSS v3.1
Score 6.5medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-106490 is an improper input validation vulnerability in the @backstage/plugin-techdocs-backend component. Specifically, when the Azure Blob Storage provider is used, an authenticated Backstage user may bypass entity-level permissions to access restricted TechDocs content. The risk increases if the default backend authentication policy is disabled. This vulnerability is addressed in version 2.2.4 of the plugin.
Potential Impact
Authenticated users may gain unauthorized read access to restricted TechDocs content, potentially exposing sensitive documentation. The vulnerability does not affect confidentiality beyond read access and does not impact integrity or availability. Deployments with disabled default backend authentication policies face broader exposure.
Mitigation Recommendations
Upgrade @backstage/plugin-techdocs-backend to version 2.2.4 or later, where the vulnerability is patched. Until the upgrade can be applied, restrict access to the TechDocs backend to users authorized to view all stored documentation and ensure the default backend authentication policy remains enabled.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-7mfx-xg57-53c9
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-106490"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6ac6c0012cdf04f6568291b5
Added to database: 10/07/2026, 21:56:17 UTC
Last enriched: 10/07/2026, 22:14:49 UTC
Last updated: 10/07/2026, 22:14:49 UTC
Views: 6
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