CVE-2026-106559
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Improper Input Validation in Backstage Confluence to Markdown 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 input validation in confluence to markdown scaffolder module. Insufficient input validation in the Confluence to Markdown scaffolder module could allow an attacker to influence file write operations during template execution. Exploitation requires a Backstage user to run a template that processes attacker-influenced Confluence content. 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-2026-106559
EUVD
EUVD-2026-94372

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-73 The product allows user input to control or influence paths or file names that are used in filesystem operations.
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 affects the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package in Backstage versions before 0.3.25. It involves improper input validation that allows attackers to manipulate file write operations during template execution by influencing Confluence content. Exploitation requires a user to run a vulnerable template.

Detection Guidance

Detecting this vulnerability requires checking the version of the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package. Run npm list @backstage/plugin-scaffolder-backend-module-confluence-to-markdown to verify if the installed version is below 0.3.25. Also review Backstage logs for file write operations during template execution that may indicate suspicious activity.

Impact Analysis

An attacker could exploit this to write files outside intended directories, potentially overwriting sensitive files or executing malicious code. This requires the victim to run a compromised template processing attacker-controlled Confluence content.

Compliance Impact

This vulnerability could lead to unauthorized file modifications, potentially violating data integrity and confidentiality requirements in GDPR and HIPAA. Unauthorized file access may result in data breaches or compliance violations depending on the affected files.

Mitigation Strategies

Immediately update the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package to version 0.3.25 or later. Restrict Confluence edit access to trusted users only and review Confluence page content before running any Backstage templates to prevent malicious input.

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