CVE-2021-47698: Nagios XI

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

Nagios XI versions prior to 5.8.7 using embedded Nagios Core are vulnerable to cross-site scripting (XSS) via the Core UI’s Views URL handling (escape_string()). 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 5.8.7 (fixed in 5.8.7)

Published 2025-11-03. Last modified 2026-06-17.