Nagios XI versions prior to 5.8.9 are vulnerable to cross-site scripting (XSS) via the Apply Configuration error text. 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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N