CVE-2024-14001 is a cross-site scripting (XSS) vulnerability identified in Nagios XI, a widely used IT infrastructure monitoring solution. The flaw exists in the Executive Summary Report component, where user-supplied input is insufficiently validated or escaped during web page generation. This improper neutralization of input (CWE-79) allows an attacker to inject arbitrary JavaScript code that executes in the context of a victim's browser session. The vulnerability is exploitable remotely over the network without authentication, though it requires user interaction, such as viewing a maliciously crafted report or link. The CVSS v4.0 base score is 5.1 (medium severity), reflecting the network attack vector, low attack complexity, no privileges required, but requiring user interaction. The impact primarily affects confidentiality and integrity by enabling session hijacking, theft of sensitive information, or unauthorized commands executed within the Nagios XI web interface. Availability impact is minimal. No known public exploits are reported yet, but the presence of this vulnerability in monitoring infrastructure software poses a risk of lateral movement or privilege escalation if chained with other exploits. The vulnerability affects all Nagios XI versions prior to 2024R1.1.3, and no official patch links are currently provided, indicating that organizations should monitor vendor advisories closely. The vulnerability's scope is limited to the web interface component but can have significant consequences given Nagios XI's role in monitoring critical IT environments.

For European organizations, the impact of CVE-2024-14001 can be significant due to Nagios XI's widespread use in monitoring enterprise IT infrastructure, including networks, servers, and applications. Successful exploitation could allow attackers to execute arbitrary scripts in the context of legitimate users, potentially leading to session hijacking, credential theft, or unauthorized configuration changes. This could disrupt monitoring operations, delay incident detection, or facilitate further compromise within the network. Critical sectors such as finance, energy, telecommunications, and government agencies relying on Nagios XI for operational visibility are particularly at risk. Additionally, the vulnerability could be leveraged as part of a multi-stage attack to gain deeper access or exfiltrate sensitive data. The medium severity rating suggests moderate urgency, but the strategic importance of affected systems elevates the need for timely remediation. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits following public disclosure.

1. Apply official patches or updates from Nagios as soon as they become available, specifically upgrading to version 2024R1.1.3 or later. 2. Until patches are available, restrict access to the Executive Summary Report component using network segmentation, access control lists, or VPNs to limit exposure to trusted users only. 3. Implement web application firewalls (WAFs) with rules to detect and block common XSS attack patterns targeting Nagios XI interfaces. 4. Educate users to avoid clicking on suspicious links or reports, especially those received from untrusted sources. 5. Conduct regular security assessments and penetration tests focusing on web interface components to identify similar input validation weaknesses. 6. Monitor logs and alerts for unusual activity related to Nagios XI web access, including unexpected script execution or session anomalies. 7. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the Nagios XI web application. 8. Review and harden Nagios XI user permissions to minimize the impact of compromised accounts. These targeted measures go beyond generic advice by focusing on the specific vulnerable component and operational context of Nagios XI in European environments.