CVE-2026-54114 is a use-after-free vulnerability identified in the Windows Win32K subsystem of Microsoft Windows 10 Version 1809 (build 10.0.17763.0). This flaw enables an attacker with local authorized access to elevate their privileges by exploiting improper memory handling in the Win32K component. The vulnerability has been assigned a CVSS v3.1 score of 7.8, indicating high severity with high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to remediate this vulnerability as documented in their security update guide.

An authorized local attacker can exploit this use-after-free vulnerability to elevate privileges on the affected Windows 10 Version 1809 system. Successful exploitation could lead to complete system compromise, allowing the attacker to execute code with elevated privileges, potentially impacting confidentiality, integrity, and availability of the system.

An official fix for this vulnerability is available from Microsoft. It is recommended to apply the security update provided by Microsoft as soon as possible to remediate this issue. Refer to the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54114 for details on obtaining and applying the patch.