Nagios Fusion < 4.0.1 XSS via Users/Servers Page

Advisories

severity: medium
date: October 30, 2025
Affecting: Fusion < 4.0.1
CVE: CVE-2017-20209
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
CVSS: 5.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
References: Nagios Fusion Changelog
Credit: Tisha Manandhar
Description: 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.