CVE-2024-14000 is a cross-site scripting (XSS) vulnerability classified under CWE-79 that affects Nagios XI, a widely used IT infrastructure monitoring platform. The vulnerability specifically resides in the Capacity Planning Report component of Nagios XI versions prior to 2024R1.1.3. The root cause is insufficient neutralization of user-supplied input during web page generation, allowing malicious actors to inject arbitrary JavaScript code. When a victim accesses a crafted URL or page containing the malicious payload, the injected script executes in their browser context. This can lead to session hijacking, theft of sensitive information, or unauthorized actions performed on behalf of the victim. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L - low privileges required), user interaction required (UI:P), and low scope impact (S:L). The vulnerability does not affect confidentiality, integrity, or availability directly but compromises user trust and session security. No public exploits have been reported yet, but the presence of this vulnerability in a critical monitoring tool makes it a notable risk. The lack of a patch link suggests that users should monitor Nagios advisories closely and apply updates as soon as they become available. Organizations relying on Nagios XI for monitoring should audit their deployments and restrict access to the Capacity Planning Report component until patched.

For European organizations, the impact of CVE-2024-14000 centers on the potential compromise of user sessions and the execution of unauthorized scripts within the browser context of legitimate users. This can lead to credential theft, unauthorized access to monitoring dashboards, and manipulation of monitoring data or alerts. Since Nagios XI is often deployed in critical infrastructure environments such as telecommunications, energy, finance, and government sectors, exploitation could undermine operational visibility and incident response capabilities. The vulnerability could also be leveraged as a foothold for further attacks within the network if attackers gain access to privileged monitoring interfaces. The requirement for user interaction limits mass exploitation but targeted phishing or social engineering campaigns could be effective. European organizations with strict data protection regulations (e.g., GDPR) may face compliance risks if user data is exposed or sessions are hijacked. The moderate CVSS score reflects a balanced risk that should not be ignored, especially in sectors where monitoring integrity is paramount.

1. Immediately upgrade Nagios XI installations to version 2024R1.1.3 or later once available to ensure the vulnerability is patched. 2. Until patching is possible, restrict access to the Capacity Planning Report component using network segmentation, firewall rules, or Nagios XI’s internal access controls to limit exposure. 3. Implement strict input validation and output encoding on any custom or third-party plugins or components interacting with user input to prevent injection of malicious scripts. 4. Educate users about the risks of clicking unknown or suspicious links related to Nagios XI reports to reduce the likelihood of successful social engineering. 5. Monitor web server and application logs for unusual requests or payloads targeting the Capacity Planning Report URLs. 6. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the Nagios XI web interface. 7. Regularly review and update Nagios XI and all associated components as part of a robust patch management program. 8. Conduct security assessments and penetration tests focusing on web interface vulnerabilities to detect similar issues proactively.