CVE-2026-106560
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Improper Path Validation in Backstage Scaffolder Confluence Plugin

Publication date: 2026-10-07

Last updated on: 2026-10-07

Assigner: GitHub, Inc.

Description
Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper repository path validation in a scaffolder backend module. An authenticated user who can execute an affected template and control its repository file location may cause generated content to be written outside the task workspace, within locations writable by the Backstage backend process. This issue is fixed in version 0.3.25.

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Meta Information

Published
2026-10-07
Last Modified
2026-10-07
Generated
2026-10-07
AI Q&A
2026-10-07
EPSS Evaluated
N/A
NVD
CVE-2026-106560
EUVD
EUVD-2026-94373

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
backstage backstage < 1.54.6
@backstage plugin-scaffolder-backend-module-confluence-to-markdown < 0.3.25

Helpful Resources

Exploitability

CWE
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KEV
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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

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Executive Summary

This vulnerability in Backstage's @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package allows authenticated users with template execution rights to manipulate repository file paths. This improper path validation can cause generated content to be written outside the intended workspace, potentially affecting directories accessible to the Backstage backend process.

Detection Guidance

Check if the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package version is below 0.3.25. Inspect Backstage backend logs for suspicious file write operations outside the task workspace. Review user permissions for template execution privileges.

Impact Analysis

An attacker could exploit this to modify or overwrite files in directories the Backstage backend can access, leading to potential data integrity issues or unauthorized file changes. This requires only low privileges and no user interaction, making it relatively easy to exploit.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized file modifications outside the intended workspace. If exploited, it may lead to unauthorized access or alteration of sensitive data, violating integrity and confidentiality requirements under these regulations.

Mitigation Strategies

Update the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package to version 0.3.25 or later. Restrict template execution permissions to trusted users only. Monitor file system changes in directories accessible to the Backstage backend process.

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