CVE-2025-50155 is a vulnerability identified in Microsoft Windows 10 Version 1809, specifically in the Windows Push Notifications component. The root cause is a type confusion error (CWE-843), where the system accesses a resource using an incompatible type, leading to unexpected behavior. This flaw allows an attacker with authorized local access to escalate their privileges on the affected system. The vulnerability does not require user interaction (UI:N) and has low attack complexity (AC:L), but does require the attacker to have some level of privileges already (PR:L). The CVSS v3.1 base score is 7.8, indicating a high severity due to its impact on confidentiality, integrity, and availability (all rated high). The vulnerability could allow an attacker to execute arbitrary code or perform actions with elevated privileges, potentially compromising the entire system. No public exploits have been reported yet, but the vulnerability is publicly known and published as of August 2025. The affected version is Windows 10 build 17763.0 (Version 1809), which is an older Windows release but still in use in some environments. The absence of a patch link suggests that remediation may be pending or that users should apply the latest cumulative updates from Microsoft. The vulnerability is categorized under CWE-843 (type confusion) and also tagged with CWE-122, indicating potential memory corruption issues. This vulnerability is significant for organizations that have not upgraded from Windows 10 Version 1809 or have legacy systems requiring this version.

The primary impact of CVE-2025-50155 is local privilege escalation, which can lead to full system compromise. For European organizations, this means that an attacker who gains initial local access—via phishing, insider threat, or other means—could leverage this vulnerability to gain administrative rights, bypassing security controls. This elevates the risk of data breaches, ransomware deployment, and disruption of critical services. Confidentiality is at high risk as attackers can access sensitive data; integrity is compromised as attackers can alter system files or configurations; availability is threatened by potential system instability or denial-of-service caused by malicious actions. Organizations relying on Windows 10 Version 1809 in sectors such as finance, healthcare, government, and critical infrastructure face heightened risks. The lack of user interaction requirement increases the threat as exploitation can be automated once local access is obtained. The vulnerability also poses risks to endpoint security and network integrity, potentially enabling lateral movement within corporate networks.

1. Apply Microsoft security updates as soon as they become available for Windows 10 Version 1809; monitor Microsoft’s official channels for patch releases related to this CVE. 2. If patching is not immediately possible, restrict local access to systems running Windows 10 Version 1809 by enforcing strict access controls and limiting administrative privileges. 3. Implement application whitelisting and endpoint detection and response (EDR) solutions to detect anomalous behavior related to privilege escalation attempts. 4. Regularly audit and monitor Windows Push Notification service logs and system event logs for unusual activity indicative of exploitation attempts. 5. Consider upgrading affected systems to a supported and fully patched Windows version to eliminate exposure to this and other legacy vulnerabilities. 6. Educate users and administrators about the risks of local privilege escalation and enforce strong authentication and endpoint security policies. 7. Employ network segmentation to limit the spread of an attacker who gains elevated privileges on one system. 8. Use vulnerability management tools to identify systems running Windows 10 Version 1809 and prioritize remediation efforts accordingly.