CVE-2024-58272 is a stored cross-site scripting (XSS) vulnerability identified in Nagios Log Server versions prior to 2024R1. The vulnerability stems from improper neutralization of input during web page generation (CWE-79). Specifically, the application fails to properly encode or escape attacker-supplied usernames that contain JavaScript code. These malicious usernames are stored persistently and later rendered on administrative or user-facing web pages without adequate sanitization. When an authenticated user accesses these pages, the embedded JavaScript executes within their browser context, allowing the attacker to perform actions such as session hijacking, credential theft, or unauthorized operations within the victim's session. The vulnerability requires the attacker to have at least limited authenticated access to inject the malicious username and relies on the victim's interaction with the affected page to trigger the payload. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required for exploitation (PR:L - low privileges), user interaction required (UI:P), and limited scope and impact on confidentiality, integrity, and availability (all rated none or low). No public exploits have been reported to date, but the presence of stored XSS in a monitoring tool like Nagios Log Server poses a significant risk, especially in environments where administrators or users have elevated privileges. The vulnerability highlights the importance of proper input validation and output encoding in web applications that handle user-generated content.

For European organizations, the impact of CVE-2024-58272 can be significant, particularly for those relying on Nagios Log Server for critical infrastructure monitoring and log management. Successful exploitation could allow attackers to execute arbitrary JavaScript in the context of authenticated users, potentially leading to session hijacking, unauthorized access to sensitive monitoring data, or manipulation of log information. This could undermine the integrity and confidentiality of monitoring data, disrupt incident response processes, and facilitate further lateral movement within the network. Given that Nagios Log Server is often used by IT and security teams, compromise of these accounts could lead to broader organizational security risks. The medium severity rating reflects that while the vulnerability requires some level of authentication and user interaction, the potential for privilege escalation and data exposure remains a concern. European sectors such as finance, energy, telecommunications, and government agencies that depend on Nagios for operational visibility are particularly vulnerable to targeted exploitation attempts.

To mitigate CVE-2024-58272, European organizations should immediately upgrade Nagios Log Server to version 2024R1 or later once available, as this will include the necessary patches to properly encode and escape user input. Until patches are applied, organizations should implement strict input validation to reject or sanitize usernames containing suspicious characters or scripts. Employ output encoding techniques on all user-generated content rendered in web pages to prevent script execution. Limit user privileges to the minimum necessary, restricting who can create or modify usernames to reduce injection vectors. Additionally, monitor web application logs for unusual input patterns or repeated attempts to inject scripts. Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and reduce the impact of any successful XSS payloads. Regularly audit and review Nagios Log Server configurations and user accounts to detect and remove any malicious entries. Finally, educate administrators and users about the risks of XSS and encourage cautious interaction with monitoring dashboards.