Backstage Cloud Storage Path Traversal Vulnerability

Publication date: 2026-10-06

Last updated on: 2026-10-06

Assigner: GitHub, Inc.

Description

Backstage is an open framework for building developer portals. Prior to 1.54.6, cloud storage catalog providers did not sufficiently validate object paths. A principal able to create or rename objects in a configured Azure Blob Storage or AWS S3 catalog source could cause catalog descriptors to be read from outside the intended storage boundary, limited to locations reachable with the backend's configured credentials. This issue is fixed in 1.54.6.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-06

Last Modified

2026-10-06

Generated

2026-10-07

AI Q&A

2026-10-07

EPSS Evaluated

N/A

NVD

CVE-2026-106493

Affected Vendors & Products

Vendor	Product	Version / Range
backstage	backstage	< 1.54.6
@backstage	plugin-catalog-backend-module-azure	< 0.17.8
@backstage	plugin-catalog-backend-module-aws	< 0.4.27
@backstage	plugin-catalog-backend-module-azure	< 0.3.21

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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

Backstage is an open framework for building developer portals. Prior to version 1.54.6, cloud storage catalog providers did not sufficiently validate object paths in Azure Blob Storage or AWS S3. This allowed principals with access to create or rename objects to read catalog descriptors from outside the intended storage boundary, limited to locations reachable with the backend's configured credentials.

Impact Analysis

A malicious actor with access to create or rename objects in a configured cloud storage catalog could read sensitive catalog descriptors outside the intended storage area. This could lead to unauthorized access to internal or confidential information, depending on the backend's permissions.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating compliance requirements such as GDPR (data protection) or HIPAA (health information privacy). Unauthorized access to catalog descriptors may expose personal or protected health information.

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