CVE-2020-9471: Umbraco CMS

High severity, CVSS 8.8. EPSS: 2.3% chance of exploitation in the next 30 days.

Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install Packages functionality.

Affected products

• Umbraco Umbraco CMS: version 8.5.3 only

Published 2020-03-16. Last modified 2026-06-17.