What’s Vulnerable › Vulnerabilities

CVE-2026-106560: Backstage: Improper repository path validation in a Scaffolder backend module

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-07 · updated 2026-10-16
• Weakness: CWE-22

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.

Affected products

• backstage: before 1.54.6 — fixed in 1.54.6
• Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Confluence-To-Markdown: before 0.3.25 — fixed in 0.3.25

How to fix

Upgrade to a fixed version: backstage 1.54.6; Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Confluence-To-Markdown 0.3.25. Check the vendor advisory for mitigations.

References

• https://github.com/backstage/backstage/commit/5f0000c1d0af05571e357926b3fa33a453337ff0
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-2cmg-v53w-8xfp

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