CVE-2026-106462: @backstage Plugin-Scaffolder-Backend

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Backstage is an open framework for building developer portals. Prior to 1.54.6, scaffolder source-control actions may not consistently enforce intended credential boundaries. An authenticated user could cause an affected action to fall back to broader integration credentials and perform operations with more access than intended. This issue is fixed in 1.54.6 when operators also enable scaffolder.requireScmUserCredentials after upgrading.

Affected products

• @backstage Plugin-Scaffolder-Backend: before 4.1.0 (fixed in 4.1.0)
• @backstage Plugin-Scaffolder-Backend-Module-Azure: before 0.2.25 (fixed in 0.2.25)
• @backstage Plugin-Scaffolder-Backend-Module-Bitbucket-Cloud: before 0.3.10 (fixed in 0.3.10)
• @backstage Plugin-Scaffolder-Backend-Module-Bitbucket-Server: before 0.2.25 (fixed in 0.2.25)
• @backstage Plugin-Scaffolder-Backend-Module-GitHub: before 0.9.13 (fixed in 0.9.13)
• @backstage Plugin-Scaffolder-Backend-Module-GitLab: before 0.11.10 (fixed in 0.11.10)
• Backstage Backstage: before 1.54.6 (fixed in 1.54.6)

Published 2026-10-06. Last modified 2026-10-07.