CVE-2026-106499 — Backstage: Secret-derived values may be exposed in scaffolder task logs
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 …
Published: 2026-10-06 · CVSS: 4.9 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7