CVE-2026-87709
Windows Host Guardian Service Tampering Vulnerability
MEDIUM
5.5
CVSS Score
Published: October 13, 2026 at 07:01 PM UTC
Updated: October 28, 2026 at 08:08 PM UTC
12 products affected across 1 vendorWindows Server 2019Windows 10 1809Windows Server 2022
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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit
Description
Improper access control in Windows Host Guardian Service allows an authorized attacker to perform tampering locally.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 10.0.17763.937610.0.17763.0
v < 10.0.19044.780710.0.19044.0
v < 10.0.19045.780710.0.19045.0
v < 10.0.22631.765210.0.22631.0
v < 10.0.26100.971110.0.26100.0
v < 10.0.26200.971110.0.26200.0
v < 10.0.28000.323110.0.28000.0
v < 10.0.26300.9711
v < 10.0.17763.937610.0.17763.0
v < 10.0.20348.576110.0.20348.0
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87709SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.5MEDIUMmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-250
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