CVE-2026-106459: @backstage Plugin-Scaffolder-Backend-Module-Sentry

High severity, CVSS 8.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.

Affected products

• @backstage Plugin-Scaffolder-Backend-Module-Sentry: from 0.3.0, before 0.3.8 (fixed in 0.3.8)
• Backstage Backstage: from 1.47.0, before 1.54.8 (fixed in 1.54.8)

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