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CVE-2026-87709 is a medium severity vulnerability in Microsoft Windows 10 Version 1809 related to improper access control in the Windows Host Guardian Service. It allows an authorized local attacker to perform tampering by executing actions with unnecessary privileges. The vulnerability does not impact confidentiality or availability but can lead to integrity violations. An official fix is available from Microsoft.

This vulnerability (CVE-2026-87709) involves improper access control (CWE-250) in the Windows Host Guardian Service on Windows 10 Version 1809. An authorized attacker with local access can exploit this flaw to perform tampering actions with elevated privileges beyond what is necessary. The CVSS 3.1 base score is 5.5 (medium), reflecting local attack vector, low attack complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or availability impact, but high integrity impact. Microsoft has issued an official fix for affected versions.

CVE-2026-87709 is a medium severity vulnerability in Microsoft Windows 10 Version 1809 related to improper access control in the Windows Host Guardian Service. It allows an authorized local attacker to perform tampering by executing actions with unnecessary privileges. The vulnerability does not imp

CVE-2026-87709: CWE-250: Execution with Unnecessary Privileges in Microsoft Windows 10 Version 1809

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