What is CVE-2026-66802?

CVE-2026-66802 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-66802 cover?

CVE-2026-66802 covers the following CVE IDs: CVE-2026-66802. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-66802?

CVE-2026-66802 has a CVSS v3 base score of 8.1, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-66802?

CVE-2026-66802 affects 10 products, including: Windows 10 Version 1809 for 32-bit Systems; Windows 10 Version 1809 for x64-based Systems; Windows 11 Version 26H1 for ARM64-based Systems; Windows 11 version 26H1 for x64-based Systems; Windows Server 2019; and others — see the full list on the advisory page.

CVE-2026-66802CriticalCVSS 8.1

Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-66802 →

📋 Description

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

🎯 Affected products10

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Windows 11 version 26H1 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5120238 (Security Update) — fixed build 10.0.17763.9115 KB5120242 (Security Update) — fixed build 10.0.20348.5499 KB5120229 (Security Hotpatch Update) — fixed build 10.0.20348.5440 KB5120233 (Security Update) — fixed build 10.0.26100.33296 KB5120228 (Security Hotpatch Update) — fixed build 10.0.26100.33222 KB5121000 (Security Update) — fixed build 10.0.28000.2704

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products10

✅ Remediation

🔗 References (13)