CVE-2025-27358 is a medium-severity vulnerability classified under CWE-80, which pertains to improper neutralization of script-related HTML tags in a web page, commonly known as a basic Cross-Site Scripting (XSS) vulnerability. This specific issue affects the N-Media Frontend File Manager product up to version 23.2. The vulnerability allows an attacker with at least limited privileges (PR:L) and requiring user interaction (UI:R) to inject malicious scripts into web pages served by the Frontend File Manager. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L) indicates that the attack can be launched remotely over the network with low attack complexity, but requires some level of authenticated access and user interaction to succeed. The impact primarily affects the integrity and availability of the affected system, with no direct confidentiality loss. The vulnerability arises from insufficient sanitization or encoding of user-supplied input that is reflected or stored and then rendered in the web interface, enabling script injection. Although no known exploits are currently reported in the wild and no official patches have been linked yet, the presence of this vulnerability in a file management frontend used in web environments poses a risk of session hijacking, defacement, or denial of service through script execution in the context of authenticated users.

For European organizations, the exploitation of this XSS vulnerability in N-Media Frontend File Manager could lead to unauthorized script execution within the browsers of legitimate users, potentially allowing attackers to manipulate the integrity of file management operations or disrupt availability. While confidentiality is not directly compromised, the injected scripts could be leveraged to perform actions on behalf of authenticated users, such as modifying or deleting files, or conducting further attacks within the network. Organizations relying on this product for managing web-accessible file repositories may face operational disruptions and reputational damage if attackers exploit this vulnerability. Given the requirement for authenticated access and user interaction, insider threats or social engineering could increase the risk. The vulnerability could also be used as a pivot point for more sophisticated attacks targeting European enterprises, especially those in sectors with high reliance on web-based file management solutions.

To mitigate this vulnerability, European organizations should first verify if they are using N-Media Frontend File Manager versions up to 23.2 and plan for immediate updates once patches become available. In the interim, organizations should implement strict input validation and output encoding on all user-supplied data rendered in the frontend interface to neutralize script tags and prevent injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the application context. Limit user privileges to the minimum necessary to reduce the impact of potential exploitation. Additionally, enhance user awareness and training to recognize and avoid social engineering attempts that could trigger the required user interaction for exploitation. Monitoring web logs for unusual script injection attempts and anomalous user behavior can help detect exploitation attempts early. Network segmentation and application-layer firewalls can further reduce exposure.