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[ CVE-2026-106500 · Published 6 Oct 2026 ]

Backstage: Improper task state validation in Scaffolder backend

CVSS 8.5 EPSS <1%Fix available

[ Description ]Official description

Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

[ Fixes ]Fixes and patches

[ Packages ]Affected open-source packages

  • @backstage/plugin-scaffolder-backend npmAffected < 4.1.0 · fixed in 4.1.0 · GHSA-xvgh-hmx8-9xxf

[ References ]References