CVE-2021-47690: Nagios XI

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

The Core Config Manager (CCM) in Nagios XI versions prior to CCM 3.1.1 / Nagios XI 5.8.2 contains multiple cross-site scripting (XSS) vulnerabilities in Overlay modals. 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 Nagios XI: before 5.8.2 (fixed in 5.8.2)

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