CVE-2024-53457 is a stored cross-site scripting (XSS) vulnerability identified in the Device Settings section of LibreNMS versions 24.9.0 through 24.10.0. This vulnerability arises from insufficient sanitization of user-supplied input in the Display Name parameter, allowing an attacker to inject arbitrary HTML or JavaScript code. When a crafted payload is submitted, it is stored persistently and executed in the browsers of users who view the affected device settings page. The vulnerability requires the attacker to have limited privileges (PR:L) to modify device settings and some user interaction (UI:R) to trigger the malicious script execution. The scope is changed (S:C), meaning the vulnerability can affect other users beyond the attacker. The CVSS 3.1 base score is 5.4, reflecting a medium severity level, with impacts on confidentiality and integrity but no direct availability impact. While no known exploits are currently reported in the wild, the vulnerability poses risks such as session hijacking, credential theft, or unauthorized actions performed in the context of the victim’s session. The root cause is a CWE-79 (Improper Neutralization of Input During Web Page Generation) flaw. LibreNMS is an open-source network monitoring system widely used by organizations to monitor network devices and infrastructure. The vulnerability specifically targets the Display Name parameter in device settings, a field that can be modified by users with certain privileges, making privilege management critical. No official patches or fixes are listed yet, so mitigation relies on configuration and monitoring until updates are available.

The impact of CVE-2024-53457 on organizations worldwide includes potential compromise of user sessions and unauthorized actions within the LibreNMS web interface. Attackers exploiting this vulnerability can execute malicious scripts in the browsers of other users, potentially leading to theft of authentication tokens, redirection to malicious sites, or manipulation of displayed data. This can undermine the confidentiality and integrity of network monitoring data and user credentials. Since LibreNMS is often used in enterprise and service provider environments to monitor critical network infrastructure, exploitation could facilitate further lateral movement or reconnaissance by attackers. Although the vulnerability does not directly affect system availability, the indirect consequences of compromised credentials or session hijacking could lead to broader security incidents. Organizations with multiple users accessing LibreNMS are at higher risk, especially if privilege separation is weak. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once the vulnerability becomes public knowledge.

To mitigate CVE-2024-53457, organizations should first restrict the ability to modify device Display Name parameters to trusted administrators only, minimizing the attack surface. Implement strict input validation and output encoding on all user-supplied data fields, especially those rendered in the web interface, to prevent injection of malicious scripts. Monitor web application logs and user activity for unusual or unauthorized changes to device settings. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. Until an official patch is released, consider deploying web application firewalls (WAFs) with rules to detect and block XSS payloads targeting LibreNMS. Educate users about the risks of clicking on suspicious links or interacting with untrusted content within the monitoring system. Regularly update LibreNMS to the latest versions once patches addressing this vulnerability become available. Conduct security assessments and penetration testing focused on web interface vulnerabilities to identify and remediate similar issues proactively.