CVE-2025-50155 is a vulnerability classified under CWE-843 (Access of Resource Using Incompatible Type, or type confusion) affecting Microsoft Windows 10 Version 1809 (build 10.0.17763.0). This flaw exists within the Windows Push Notifications service, where improper handling of resource types allows an attacker with authorized local access to exploit type confusion. This leads to a local privilege escalation (LPE), enabling the attacker to gain elevated 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 (high), reflecting the critical impact on confidentiality, integrity, and availability (all rated high). The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component and does not extend beyond it. No known exploits have been reported in the wild yet, but the vulnerability's characteristics suggest it could be leveraged for post-compromise escalation or lateral movement within networks. The vulnerability was reserved in June 2025 and published in August 2025, indicating recent discovery. No official patches or mitigation links are currently provided, so organizations must monitor vendor advisories closely. The vulnerability's presence in Windows 10 Version 1809, a widely deployed enterprise OS version, increases its potential impact in corporate environments.

For European organizations, this vulnerability poses a significant risk, especially in sectors relying heavily on Windows 10 Version 1809, such as government, finance, healthcare, and critical infrastructure. Successful exploitation allows attackers who have already gained limited local access to escalate privileges, potentially leading to full system compromise, unauthorized data access, and disruption of services. This can facilitate further lateral movement within networks, increasing the risk of widespread breaches. The high impact on confidentiality, integrity, and availability could result in data theft, manipulation, or denial of service. Given the vulnerability does not require user interaction and has low complexity, insider threats or malware with limited privileges could exploit it effectively. The lack of known exploits currently provides a window for proactive defense, but the vulnerability's presence in legacy systems that may not be regularly updated increases the risk of exploitation in less-patched environments.

1. Prioritize patch management: Monitor Microsoft security advisories closely and apply official patches or updates as soon as they become available for Windows 10 Version 1809. 2. Restrict local access: Limit local user accounts with privileges to only those necessary, and enforce strict access controls to reduce the risk of an attacker gaining initial foothold. 3. Employ application whitelisting and endpoint protection solutions capable of detecting unusual privilege escalation attempts. 4. Use Group Policy to disable or restrict Windows Push Notifications where feasible, especially on high-risk or sensitive systems. 5. Conduct regular audits of user privileges and system logs to detect suspicious activities indicative of exploitation attempts. 6. Consider upgrading affected systems to newer, supported Windows versions that do not contain this vulnerability, if patching is delayed or unavailable. 7. Implement network segmentation to limit lateral movement opportunities if a local compromise occurs. 8. Educate IT staff and users about the risks of local privilege escalation vulnerabilities and the importance of maintaining updated systems.