CVE-2017-20209: Nagios Fusion

Medium severity, CVSS 6.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Nagios Fusion versions prior to 4.0.1 are vulnerable to cross-site scripting (XSS) via the Users and Servers pages. Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.

Affected products

• Nagios Fusion: version 4.0.0 only

Published 2025-10-30. Last modified 2026-06-17.