This vulnerability, identified as CVE-2026-26184 and classified under CWE-126 (Buffer Over-read), affects Windows 10 Version 1809 (build 10.0.17763.0). It arises from improper handling in the Windows Projected File System, enabling a local attacker with authorized access to read beyond buffer boundaries, potentially leading to privilege escalation. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability as documented in their security update guide.

Successful exploitation of this vulnerability could allow an authorized local attacker to elevate their privileges on the affected system. This could lead to full control over the system, compromising confidentiality, integrity, and availability of data and system resources.

An official fix is available from Microsoft. It is strongly recommended to apply the security update provided by Microsoft for Windows 10 Version 1809 (build 10.0.17763.0) as detailed in the Microsoft security update guide: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26184. No additional mitigation steps are indicated beyond applying the official patch.