CVE-2020-5810: Umbraco CMS

Medium severity, CVSS 5.4. EPSS: 62% chance of exploitation in the next 30 days.

A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current. An authenticated user authorized to upload media can upload a malicious .svg file which act as a stored XSS payload.

Affected products

• Umbraco Umbraco CMS: up to and including 8.9.1

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