Summary
Impact: Tampering. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What could an attacker achieve by exploiting this vulnerability?
An attacker could exploit this vulnerability to make unauthorized modifications to protected system data. This could allow the attacker to alter system state or configuration beyond their normal privileges.
Security updates
10.0.17763.9376 — https://support.microsoft.com/help/5126651
10.0.20348.5761 — https://support.microsoft.com/help/5126655
10.0.19044.7807 — https://support.microsoft.com/help/5126657
10.0.26100.33650 — https://support.microsoft.com/help/5126646
10.0.26200.9711 — https://support.microsoft.com/help/5127648
10.0.22631.7652 — https://support.microsoft.com/help/5126653
10.0.28000.3231 — https://support.microsoft.com/help/5127646
Vulnerabilities 1
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Medium 5.5
Windows Host Guardian Service Tampering Vulnerability
Improper access control in Windows Host Guardian Service allows an authorized attacker to perform tampering locally.
Revision history
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#1
Information published.
References
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CVE-2026-87709 Windows Host Guardian Service Tampering Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87709
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss