Backstage up to 0.3.24 Confluence to Markdown Scaffolder input validation

Summaryinfo

A vulnerability was found in Backstage up to 0.3.24. It has been declared as problematic. This vulnerability affects unknown code of the component Confluence to Markdown Scaffolder Module. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-106559. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Backstage up to 0.3.24 and classified as problematic. Affected by this issue is some unknown processing of the component Confluence to Markdown Scaffolder Module. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-106559 since 10/06/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 0.3.25 eliminates this vulnerability.

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Productinfo

Name

• Backstage

Version

• 0.3.0
• 0.3.1
• 0.3.2
• 0.3.3
• 0.3.4
• 0.3.5
• 0.3.6
• 0.3.7
• 0.3.8
• 0.3.9
• 0.3.10
• 0.3.11
• 0.3.12
• 0.3.13
• 0.3.14
• 0.3.15
• 0.3.16
• 0.3.17
• 0.3.18
• 0.3.19
• 0.3.20
• 0.3.21
• 0.3.22
• 0.3.23
• 0.3.24

Website

• Product: https://github.com/backstage/backstage/

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