[ CVE-2026-106499 · Published 6 Oct 2026 ]
Backstage: Secret-derived values may be exposed in scaffolder task logs
CVSS 4.9
EPSS <1%Fix available
[ Description ]Official description
Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.
[ Fixes ]Fixes and patches
- @backstage/plugin-scaffolder-backend 4.1.0Fixed version · GitHub Advisories · npm package @backstage/plugin-scaffolder-backend: upgrade to 4.1.0 or later (affected < 4.1.0)
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ Packages ]Affected open-source packages
- @backstage/plugin-scaffolder-backend npmAffected < 4.1.0 · fixed in 4.1.0 · GHSA-mfvq-x7vr-rgqg