CVE-2025-53156 is a medium-severity vulnerability identified in Microsoft Windows Server 2025, specifically affecting the Server Core installation version 10.0.26100.0. The vulnerability is categorized under CWE-200, which involves the exposure of sensitive information to unauthorized actors. The root cause lies within the Storage Port Driver component of the operating system. An attacker with authorized local access and low privileges can exploit this flaw to disclose sensitive information without requiring user interaction. The CVSS 3.1 base score is 5.5, reflecting moderate impact primarily on confidentiality, with no impact on integrity or availability. The attack vector is local, meaning the attacker must have some level of access to the system, but the attack complexity is low, and privileges required are low. The vulnerability does not require user interaction, and the scope remains unchanged, indicating the exploit affects only the vulnerable component without extending to other system components. No known exploits are currently reported in the wild, and no patches have been linked yet. This vulnerability could allow an attacker to gather sensitive data from the Storage Port Driver, potentially aiding further attacks or unauthorized data disclosure within the affected system environment.

For European organizations, this vulnerability poses a risk primarily to environments running Windows Server 2025 Server Core installations, which are commonly used in data centers, cloud infrastructure, and enterprise server environments. Exposure of sensitive information could lead to leakage of critical system or operational data, which may be leveraged for privilege escalation, lateral movement, or targeted attacks. Given the local access requirement, the threat is more relevant in scenarios where insider threats or compromised user accounts exist. Organizations with strict data protection regulations, such as GDPR, could face compliance risks if sensitive information is disclosed. Additionally, sectors with high-value data like finance, healthcare, and government institutions in Europe could be more impacted due to the sensitivity of the information potentially exposed. While the vulnerability does not directly affect system availability or integrity, the confidentiality breach could undermine trust and lead to reputational damage or regulatory penalties.

To mitigate this vulnerability, European organizations should prioritize the following actions: 1) Monitor and restrict local access to Windows Server 2025 Server Core systems, ensuring that only trusted and necessary personnel have login privileges. 2) Implement strict access controls and auditing on servers to detect any unauthorized or suspicious local activities. 3) Apply the official security updates or patches from Microsoft as soon as they become available, even though none are currently linked, organizations should stay vigilant for patch releases. 4) Employ endpoint detection and response (EDR) solutions capable of identifying anomalous behavior related to Storage Port Driver access or information disclosure attempts. 5) Use network segmentation to limit the exposure of critical servers and reduce the risk of lateral movement by attackers with local access. 6) Conduct regular security awareness training to reduce the risk of insider threats and ensure proper handling of privileged accounts. 7) Review and harden server configurations to minimize unnecessary services and reduce the attack surface on Server Core installations.