Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-106499

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 17.8%
CVSS Severity
CVSS v3 Score 4.9
Products affected by CVE-2026-106499


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