CVE-2020-8821: Webmin

Medium severity, CVSS 5.4. EPSS: 79.1% chance of exploitation in the next 30 days.

An Improper Data Validation Vulnerability exists in Webmin 1.941 and earlier affecting the Command Shell Endpoint. A user may enter HTML code into the Command field and submit it. Then, after visiting the Action Logs Menu and displaying logs, the HTML code will be rendered (however, JavaScript is not executed). Changes are kept across users.

Affected products

• Webmin Webmin: up to and including 1.941

Published 2020-10-12. Last modified 2026-06-17.