Execution with unnecessary privileges in Microsoft Windows and Windows Server - CVE-2026-87709
Published: October 14, 2026
Vulnerability identifier: #VU155272
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-87709
CWE-ID: CWE-250
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to alter system state or configuration beyond their normal privileges.
The vulnerability exists due to improper access control in Windows Host Guardian Service when accessing protected system data locally. A local user can make unauthorized modifications to protected system data to alter system state or configuration beyond their normal privileges.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-87709
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7807, 10 1809 10.0.17763.9376, 11 23H2 10.0.22631.7652, 11 24H2 10.0.26100.9711, 11 25H2 10.0.26200.9711, 11 26H1 10.0.28000.3231
Windows Server - addressed in versions 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650