CVE-2026-106496

Analyzed Analyzed - Analysis Complete

BaseFortify

Publication date: 2026-10-06

Last updated on: 2026-10-16

Assigner: GitHub, Inc.

Description

Backstage is an open framework for building developer portals. Prior to 3.9.1, the @backstage/plugin-catalog-backend package is affected by inconsistent enforcement of allowed location types during catalog processing. Under certain configurations, the catalog backend could process location types that were not intended to be allowed, potentially leading to unintended file access on the backend host. This issue is fixed in version 3.9.1.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-06

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-07

EPSS Evaluated

2026-10-18

NVD

CVE-2026-106496

EUVD

EUVD-2026-94052

Affected Vendors & Products

Vendor	Product	Version / Range
linuxfoundation	backstage_plugin-catalog-backend	to 3.9.1 (exc)
linuxfoundation	backstage	to 1.54.6 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
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-catalog-backend package in Backstage versions prior to 3.9.1. It involves inconsistent enforcement of allowed location types during catalog processing, which could allow the backend to process unintended location types and potentially lead to unauthorized file access on the host system.

Detection Guidance

To detect this vulnerability, check the version of @backstage/plugin-catalog-backend. If it is below 3.9.1, the system is vulnerable. Run: npm list @backstage/plugin-catalog-backend or yarn list @backstage/plugin-catalog-backend to verify the installed version.

Impact Analysis

The impact includes potential unauthorized access to files on the backend host system. This could lead to data leaks or manipulation if an attacker exploits the misconfigured location types to access sensitive files.

Compliance Impact

The vulnerability could lead to unintended file access on the backend host, which may result in unauthorized data exposure. This could potentially violate compliance requirements under GDPR (data protection) and HIPAA (health information security) if sensitive data is accessed or leaked.

Mitigation Strategies

Upgrade the @backstage/plugin-catalog-backend package to version 3.9.1 or later to address the inconsistent enforcement of allowed location types.

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