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HIGH · 8.1

CVE-2026-66802

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.

Vulnerability 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.

CVSS Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows 10 1809< 10.0.17763.9121
MicrosoftWindows 11 26H1< 10.0.28000.2704
MicrosoftWindows Server 2019< 10.0.17763.9121
MicrosoftWindows Server 2022< 10.0.20348.5440
MicrosoftWindows Server 2025< 10.0.26100.33222

Related Weaknesses (CWE)

CWE-362CWE-416

References

FAQ

What is CVE-2026-66802?

CVE-2026-66802 is a vulnerability with a CVSS score of 8.1 (HIGH). 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.

How severe is CVE-2026-66802?

CVE-2026-66802 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-66802?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 1809, Microsoft Windows 11 26H1, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.