Plugin scaffolder backend module confluence to markdown: Backstage: Improper input validation in Confluence to Markdown scaffolder module (CVE-2026-106559)
Description
An input validation vulnerability in the Confluence to Markdown scaffolder module of Backstage allows an attacker to influence file write operations during template execution. Exploitation requires a Backstage user to run a template processing attacker-controlled Confluence content. The issue is patched in version 0.3.25 of the plugin.
CVSS v3.1
Score 6.3medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in @backstage/plugin-scaffolder-backend-module-confluence-to-markdown (CVE-2026-106559) is due to insufficient input validation, which could allow an attacker to influence file write operations during the execution of scaffolder templates. This requires a Backstage user to execute a template that processes Confluence content controlled or influenced by the attacker. The vulnerability is categorized under CWE-22 (Path Traversal) and CWE-73 (External Control of File Name or Path).
Potential Impact
An attacker can influence file write operations during template execution, potentially leading to unauthorized file modifications or overwrites. The CVSS 3.1 score is 6.3 (medium severity), with no confidentiality impact but high integrity impact and low availability impact. Exploitation requires user interaction and privileges to run templates in Backstage.
Mitigation Recommendations
A patch is available in version 0.3.25 of @backstage/plugin-scaffolder-backend-module-confluence-to-markdown. Users should update to this version to remediate the vulnerability. If immediate update is not possible, restrict Confluence edit access to trusted users and review Confluence page content before running scaffolder templates against untrusted pages.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-75qf-886x-5xf2
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-106559"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6ac6bffe2cdf04f6568291a2
Added to database: 10/07/2026, 21:56:14 UTC
Last enriched: 10/07/2026, 22:13:36 UTC
Last updated: 10/07/2026, 22:13:36 UTC
Views: 5
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