CVE-2025-52710 is a Stored Cross-site Scripting (XSS) vulnerability identified in Ninja Team's File Manager Pro product, affecting versions up to and including 1.8.8. The vulnerability arises from improper neutralization of input during web page generation, categorized under CWE-79. Specifically, the application fails to adequately sanitize or encode user-supplied input before rendering it in web pages, allowing an attacker to inject malicious scripts that are stored persistently on the server and executed in the context of other users' browsers when they access the affected pages. This type of vulnerability can be exploited remotely over the network (AV:N), requires low attack complexity (AC:L), but does require the attacker to have some level of privileges (PR:H) and user interaction (UI:R) for successful exploitation. The vulnerability has a CVSS v3.1 base score of 5.9, indicating a medium severity level. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact on confidentiality, integrity, and availability is limited to low levels (C:L, I:L, A:L), reflecting that while the attacker can execute scripts, the overall damage is somewhat contained. No known exploits are currently reported in the wild, and no patches have been published yet. The vulnerability primarily affects web applications running File Manager Pro, which is used to manage files via a web interface, often deployed in organizational intranets or web servers for file handling and sharing purposes.

For European organizations using Ninja Team File Manager Pro, this vulnerability poses a risk of persistent XSS attacks that can lead to session hijacking, defacement, or redirection to malicious sites, potentially compromising user credentials or delivering malware. Given the medium severity and requirement for attacker privileges and user interaction, the risk is moderate but non-negligible, especially in environments where File Manager Pro is integrated with sensitive internal systems or used by privileged users. The vulnerability could be leveraged to escalate attacks within an organization by targeting administrators or users with elevated access. Additionally, exploitation could lead to reputational damage and non-compliance with European data protection regulations such as GDPR if personal data is exposed or manipulated. The scope change indicates that the impact could extend beyond the immediate application, possibly affecting other connected systems or data. However, the absence of known exploits and the need for user interaction somewhat limit the immediacy of the threat.

Organizations should proactively audit their deployments of Ninja Team File Manager Pro to identify affected versions (up to 1.8.8). Since no official patches are currently available, immediate mitigation should include implementing Web Application Firewall (WAF) rules to detect and block typical XSS payloads targeting the File Manager Pro endpoints. Input validation and output encoding should be enforced at the application level where possible, including sanitizing user inputs before storage and encoding outputs when rendering HTML. Restricting user privileges to the minimum necessary can reduce the risk, as exploitation requires high privileges. Monitoring logs for unusual input patterns or user behavior indicative of attempted XSS attacks is recommended. Additionally, educating users about the risks of interacting with suspicious links or content within the File Manager Pro interface can reduce successful exploitation. Organizations should maintain close communication with Ninja Team for timely patch releases and apply updates promptly once available. Finally, consider isolating the File Manager Pro application within segmented network zones to limit lateral movement in case of compromise.