Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-106503

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 scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 27.6%
CVSS Severity
CVSS v3 Score 8.1
Products affected by CVE-2026-106503


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