CVE-2026-66802

Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability

State: Published
Severity: 8.1 High
Published: Aug 11, 2026
Updated: Oct 30, 2026
Reserved: Jul 27, 2026

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Device Health Attestation (DHA) allows an unauthorized attacker to execute code over a network.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416 Use After Free

Affected Products

Product	Versions
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows 11 version 26H1Microsoft	10.0.28000.0 to before 10.0.28000.2704Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5499Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.33296Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.33296Affected

References

Windows Device Health Attestation (DHA) Remote Code Execution Vulnerabilityvendor-advisorypatch

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