CVE-2024-13993: Nagios XI

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Nagios XI versions prior to < 2024R1.1.2 are vulnerable to a reflected cross-site scripting (XSS) via the login page when accessed with older web browsers. Insufficient validation or escaping of user-supplied input reflected by the login page can allow an attacker to craft a malicious link that, when visited by a victim, executes arbitrary JavaScript in the victim’s browser within the Nagios XI origin. The issue is observable under legacy browser behaviors; modern browsers may mitigate some vectors.

Affected products

• Nagios Nagios XI: before 2024 (fixed in 2024); version 2024 only

Published 2025-10-30. Last modified 2026-10-02.