CVE-2026-106490

Undergoing Analysis Undergoing Analysis - In Progress

BaseFortify

Publication date: 2026-10-06

Last updated on: 2026-10-07

Assigner: GitHub, Inc.

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 input validation in techdocs static content requests. When using the Azure Blob Storage provider, an authenticated Backstage user may be able to read restricted TechDocs content when entity-level permissions are enabled. Deployments that intentionally disable the default backend authentication policy may have broader exposure. This issue is fixed in version 2.2.4.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-06

Last Modified

2026-10-07

Generated

2026-10-19

AI Q&A

2026-10-07

EPSS Evaluated

2026-10-18

NVD

CVE-2026-106490

EUVD

EUVD-2026-94009

Affected Vendors & Products

Vendor	Product	Version / Range
backstage	backstage	< 1.54.6
@backstage	plugin-techdocs-backend	< 2.2.4

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-23	The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

Executive Summary

This vulnerability affects the @backstage/plugin-techdocs-backend package in Backstage versions prior to 2.2.4. It involves improper input validation in techdocs static content requests when using the Azure Blob Storage provider. An authenticated user may exploit this to read TechDocs content that they are not authorized to access, especially when entity-level permissions are enabled.

Detection Guidance

To detect this vulnerability, check the version of @backstage/plugin-techdocs-backend. If it is below 2.2.4, the system is vulnerable. Use commands like npm list @backstage/plugin-techdocs-backend or yarn list @backstage/plugin-techdocs-backend to verify the installed version.

Impact Analysis

If you use Backstage with the @backstage/plugin-techdocs-backend package and the Azure Blob Storage provider, an attacker with authenticated access could read sensitive TechDocs content they should not have permission to view. This could lead to unauthorized access to confidential information.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Unauthorized exposure of personal or health information could result in legal penalties and reputational damage.

Mitigation Strategies

Upgrade the @backstage/plugin-techdocs-backend package to version 2.2.4 or later to address the improper input validation issue.

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