Nagios Fusion <4.2.0 Reflected XSS in License Key Config
CVE-2023-53689 Published on October 30, 2025
Nagios Fusion < 4.2.0 License Information Reflected XSS
Nagios Fusion versions prior to 4.2.0 contain a reflected cross-site scripting (XSS) vulnerability in the license key configuration flow that can result in execution of attacker-controlled script in the browser of a user who follows a crafted URL. While the application server itself is not directly corrupted by the reflected XSS, the resulting browser compromise can lead to credential/session theft and unauthorized administrative actions.
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-2023-53689 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2023-53689
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Affected Versions
Nagios Fusion:- Before 4.2.0 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.