CVE-2025-59204 is a vulnerability classified under CWE-908 (Use of Uninitialized Resource) affecting Microsoft Windows 11 Version 25H2 (build 10.0.26200.0). The flaw resides in Windows Management Services, where an uninitialized resource is used, potentially leading to the disclosure of sensitive information. An authorized attacker with local access and low privileges can exploit this vulnerability to read information that should remain confidential. The vulnerability does not require user interaction and does not impact system integrity or availability, focusing solely on confidentiality breaches. The CVSS v3.1 score is 5.5 (medium severity), reflecting the local attack vector (AV:L), low attack complexity (AC:L), and the need for privileges (PR:L). The scope remains unchanged (S:U), and the impact is high on confidentiality (C:H) but none on integrity (I:N) or availability (A:N). No public exploits or patches are currently available, but the vulnerability has been officially published and reserved since September 2025. This vulnerability could be leveraged in targeted attacks or insider threat scenarios to gain unauthorized access to sensitive data on affected systems.

For European organizations, the primary impact is the potential unauthorized disclosure of sensitive information stored or processed by Windows Management Services on Windows 11 Version 25H2 systems. This could include internal configuration data, credentials, or other sensitive operational information. Such leakage could aid attackers in further lateral movement or privilege escalation within networks. Sectors with high reliance on Microsoft Windows 11, such as finance, healthcare, government, and critical infrastructure, could face increased risks of data breaches or espionage. Although remote exploitation is not feasible, insider threats or compromised local accounts could exploit this vulnerability. The impact on confidentiality could lead to regulatory compliance issues under GDPR if personal or sensitive data is exposed. However, since integrity and availability are unaffected, the risk of system disruption or data manipulation is minimal.

European organizations should implement strict access controls to limit local user privileges and restrict access to Windows Management Services. Employing the principle of least privilege will reduce the risk of exploitation by low-privileged users. Monitoring and logging local access to critical systems can help detect suspicious activities indicative of exploitation attempts. Network segmentation can isolate sensitive systems to minimize insider threat risks. Organizations should prioritize patch management and apply security updates from Microsoft as soon as they become available for this vulnerability. In the interim, consider disabling or restricting Windows Management Services if feasible, or applying configuration hardening to reduce attack surface. Conduct internal audits to identify systems running the affected Windows 11 build and remediate accordingly. Employee awareness about the risks of local privilege misuse can also help mitigate insider threats.