CVE-2025-59211 is a vulnerability classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) affecting the Windows Push Notification Core component in Microsoft Windows 11 Version 25H2 (build 10.0.26200.0). This vulnerability allows an attacker who has already gained local access with low privileges (PR:L) to disclose sensitive information stored or processed by the Push Notification Core without requiring any user interaction (UI:N). The attack vector is local (AV:L), meaning the attacker must have some form of access to the system, but the attack complexity is low (AC:L), indicating no special conditions are needed beyond local access. The vulnerability does not affect system integrity or availability but has a high impact on confidentiality (C:H), as sensitive information can be exposed to unauthorized actors. The scope is unchanged (S:U), meaning the vulnerability affects only the vulnerable component and does not extend to other system components. The exploitability is currently theoretical, with no known exploits in the wild. The vulnerability was reserved on September 11, 2025, and published on October 14, 2025. No patches or mitigation details are currently provided, but Microsoft is the vendor responsible for addressing this issue. The vulnerability is significant for environments where local access cannot be tightly controlled or where sensitive data is handled by the Push Notification Core.

For European organizations, this vulnerability poses a confidentiality risk primarily in environments where multiple users share systems or where attackers might gain local access through other means (e.g., phishing, physical access, or lateral movement). Sensitive information exposure could lead to data leaks, compliance violations (such as GDPR breaches), and potential reputational damage. Sectors like finance, healthcare, and government are particularly sensitive to such data exposure. Although the vulnerability does not allow remote exploitation or system compromise, the local nature means insider threats or attackers who have already breached perimeter defenses could leverage this to escalate information gathering. The lack of current exploits reduces immediate risk but does not eliminate the need for proactive mitigation. Organizations relying heavily on Windows 11 25H2, especially in shared or multi-user environments, should be vigilant. The impact on availability and integrity is negligible, but confidentiality impact is high, which is critical for data protection regulations in Europe.

1. Apply security patches from Microsoft as soon as they become available to address this vulnerability directly. 2. Restrict local access to systems running Windows 11 Version 25H2, especially in sensitive environments, by enforcing strict access controls and monitoring. 3. Implement robust endpoint security solutions that can detect and prevent unauthorized local activities. 4. Use application whitelisting and least privilege principles to limit the ability of low-privileged users to access sensitive components like the Push Notification Core. 5. Monitor logs and system behavior for unusual local access patterns that could indicate exploitation attempts. 6. Educate users and administrators about the risks of local access vulnerabilities and enforce physical security controls to prevent unauthorized device access. 7. Consider network segmentation and isolation for critical systems to reduce the risk of lateral movement leading to local access. 8. Regularly audit and review user privileges to ensure only necessary access is granted.