CVE-2025-59211 is a vulnerability identified in the Windows Push Notification Core component of Microsoft Windows 11 Version 25H2 (build 10.0.26200.0). The issue is categorized under CWE-200, which involves the exposure of sensitive information to unauthorized actors. Specifically, this vulnerability allows an attacker with local access and low privileges to disclose sensitive information stored or processed by the Windows Push Notification Core without requiring any user interaction. The vulnerability does not allow modification or disruption of system operations but compromises confidentiality by leaking potentially sensitive data. The CVSS 3.1 base score is 5.5, indicating a medium severity level, with the vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, meaning the attack requires local access, low attack complexity, privileges, no user interaction, unchanged scope, and results in high confidentiality impact but no integrity or availability impact. No public exploits or patches are currently available, but the vulnerability is officially published and recognized by Microsoft. The vulnerability's exploitation could be leveraged in scenarios where an attacker gains limited local access, such as through compromised user accounts or insider threats, to extract sensitive information from affected Windows 11 systems.

For European organizations, this vulnerability poses a confidentiality risk, particularly in environments where local access controls are weak or where attackers may gain low-privilege access to endpoints running Windows 11 Version 25H2. The exposure of sensitive information could lead to data leakage, potentially compromising personal data, intellectual property, or security-related information. While the vulnerability does not affect system integrity or availability, the confidentiality breach could facilitate further attacks or compliance violations under GDPR and other data protection regulations. Organizations in sectors such as finance, healthcare, government, and critical infrastructure, which rely heavily on Windows 11 endpoints, may face increased risk if attackers exploit this vulnerability to gather sensitive information for lateral movement or espionage. The lack of known exploits in the wild reduces immediate risk but should not lead to complacency, as attackers may develop exploits once patches are released or if the vulnerability is reverse-engineered.

European organizations should implement the following specific mitigations: 1) Enforce strict local access controls and limit the number of users with local privileges on Windows 11 25H2 systems to reduce the attack surface. 2) Monitor and audit local user activities to detect unauthorized access attempts or suspicious behavior. 3) Apply the official patch from Microsoft promptly once it becomes available to remediate the vulnerability. 4) Use endpoint detection and response (EDR) solutions to identify attempts to exploit local vulnerabilities or unusual access to Windows Push Notification Core components. 5) Employ application whitelisting and privilege management to restrict execution of unauthorized code or scripts that could leverage this vulnerability. 6) Educate users about the risks of local credential compromise and enforce strong authentication mechanisms to prevent unauthorized local access. 7) Consider network segmentation to isolate critical systems and limit lateral movement opportunities for attackers who gain local access.