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Nagios XI versions prior to 5.2.4 are vulnerable to cross-site scripting (XSS) via the Reports interface through values from the startdate and enddate fields. The vulnerability was discovered and disclosed on October 30, 2025 (VulnCheck Advisory).
The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation) with a CVSS v4.0 score of 5.1 MEDIUM (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). The issue stems from insufficient validation or escaping of user-supplied input in the startdate and enddate fields of the Reports interface (VulnCheck Advisory, NVD).
This vulnerability could allow an attacker to inject and execute arbitrary script in the context of a victim's browser. The attack requires user interaction and authenticated access to the Reports interface (VulnCheck Advisory).
The vulnerability has been patched in Nagios XI version 5.2.4. Users should upgrade to this version or later to mitigate the risk (Nagios Changelog).
Source: This report was generated using AI
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