Nagios Fusion XSS Users/Servers (<4.0.1)
CVE-2017-20209 Published on October 30, 2025
Nagios Fusion < 4.0.1 XSS via Users/Servers Page
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.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2017-20209 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2017-20209
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Affected Versions
Nagios Fusion:- Before 4.0.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.