Severity: MEDIUM Date: October 24, 2025 Affecting: XI < 2024R1.1 CVE: CVE-2024-13992 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 XI Security Disclosures - Nagios XI Changelog Credit: Adam Kues from Assetnote Description: Nagios XI versions prior to < 2024R1.1 are vulnerable to a cross-site scripting (XSS) attack when a user visits a "missing page" (404) after following a link from another site. The vulnerable component, page-missing.php, fails to validate or escape user input properly, allowing an attacker to create a malicious link that executes arbitrary JavaScript in the victim's browser within the Nagios XI domain.