CVE-2020-5811: Umbraco CMS

Medium severity, CVSS 6.5. EPSS: 9.5% chance of exploitation in the next 30 days.

An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.

Affected products

• Umbraco Umbraco CMS: up to and including 8.9.1

Published 2020-12-30. Last modified 2026-06-17.