by Kastro CVE-2026-106501
backstage backstage — Backstage: Sensitive information exposure in Scaffolder
Description · from the CVE record
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 sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Affected
ProductAffectedFixed inSource
backstage< 1.49.6–CNA
backstage>= 1.50.0-next.0, < 1.50.5–CNA
backstage>= 1.51.0-next.0, < 1.54.6–CNA
plugin-scaffolder-backend< 3.3.1–CNA
plugin-scaffolder-backend>= 3.4.0, < 3.4.1–CNA
plugin-scaffolder-backend>= 4.0.0, < 4.0.3–CNA
plugin-scaffolder-backend>= 4.0.4, < 4.1.0–CNA
Scores by source
GitHub_M (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total