CVE-2025-52378 is a Cross-Site Scripting (XSS) vulnerability identified in the firmware of the Nexxt Solutions NCM-X1800 Mesh Router, specifically in versions UV1.2.7 and below. The vulnerability arises from improper sanitization of the DEVICE_ALIAS parameter in the /web/um_device_set_aliasname endpoint. An attacker can exploit this flaw by injecting malicious JavaScript code into the DEVICE_ALIAS parameter. When an administrator accesses the device management page, the injected script executes within the context of the administrator's session. This execution context allows the attacker to potentially hijack the administrator's session, steal sensitive information such as authentication tokens, or perform unauthorized actions on the router's management interface. The vulnerability requires the attacker to have network access to the router's management interface, which is typically accessible within the local network or remotely if remote management is enabled. The lack of a CVSS score indicates that the vulnerability has been recently published and not yet fully assessed. No known exploits are currently reported in the wild, and no patches or mitigation links have been provided at this time. The vulnerability's impact is primarily on the confidentiality and integrity of the router's administrative functions, potentially leading to further compromise of the network if exploited successfully.

For European organizations, this vulnerability poses a significant risk, especially for those using Nexxt Solutions NCM-X1800 Mesh Routers in their network infrastructure. Successful exploitation could allow attackers to gain administrative control over the router, enabling them to manipulate network configurations, intercept or redirect traffic, and potentially launch further attacks within the internal network. This could lead to data breaches, disruption of business operations, and compromise of sensitive communications. Organizations with remote management enabled are at higher risk, as attackers could exploit the vulnerability from outside the local network. Given the critical role routers play in network security and traffic management, exploitation could undermine the overall security posture of affected organizations. Additionally, sectors with stringent data protection requirements, such as finance, healthcare, and government entities within Europe, could face regulatory and reputational consequences if this vulnerability is exploited.

To mitigate this vulnerability, European organizations should first verify if they are using the Nexxt Solutions NCM-X1800 Mesh Router with firmware version UV1.2.7 or below. Immediate actions include disabling remote management features to limit exposure to external attackers. Network administrators should restrict access to the router's management interface to trusted internal IP addresses only, using firewall rules or access control lists. Monitoring network traffic for unusual activity related to the router's management interface can help detect exploitation attempts. Organizations should also implement strict input validation and sanitization on any custom management tools interacting with the router, if applicable. It is critical to stay informed about official patches or firmware updates from Nexxt Solutions and apply them promptly once available. As a longer-term measure, consider segmenting network management interfaces onto isolated management VLANs to reduce the attack surface. Educating administrators about the risks of XSS and safe management practices will further reduce the likelihood of successful exploitation.