CVE-2026-87709
Undergoing Analysis Undergoing Analysis - In Progress

Windows Host Guardian Service Improper Access Control

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description
Improper access control in Windows Host Guardian Service allows an authorized attacker to perform tampering locally.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-87709
EUVD
EUVD-2026-100075

Affected Vendors & Products

Showing 14 associated CPEs
Vendor Product Version / Range
Microsoft Windows 10 Version 1809 10.0.17763.0
Microsoft Windows 10 Version 21H2 10.0.19044.0
Microsoft Windows 10 Version 22H2 10.0.19045.0
Microsoft Windows 11 version 23H2 10.0.22631.0
Microsoft Windows 11 Version 23H2 10.0.22631.0
Microsoft Windows 11 Version 24H2 10.0.26100.0
Microsoft Windows 11 Version 25H2 10.0.26200.0
Microsoft Windows 11 version 26H1 10.0.28000.0
Microsoft Windows 11 Version 26H2 10.0.26300.0
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-250 The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.

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Executive Summary

This vulnerability is an improper access control issue in the Windows Host Guardian Service. An authorized attacker can exploit it to perform tampering actions locally on affected systems.

Impact Analysis

An attacker with local access could modify system files or configurations, potentially leading to unauthorized changes, data corruption, or bypassing security controls.

Compliance Impact

This vulnerability could impact compliance by allowing unauthorized modifications to systems handling sensitive data, potentially violating integrity requirements in GDPR or HIPAA.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Host Guardian Service. Monitor Microsoft's security advisories for patches and follow their recommended mitigation steps.

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