Race Condition Vulnerability in Microsoft Azure Attestation Service and Device Health Attestation
CVE-2026-66802

8.1HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows 11 Version 26h1
Windows Server 2019
Windows Server 2019 (server Core Installation)
Vendor
CVE Published:
11 August 2026

What is CVE-2026-66802?

A vulnerability in Microsoft Azure Attestation and Device Health Attestation Services arises from improper synchronization during concurrent execution using shared resources. This flaw potentially enables unauthorized attackers to execute arbitrary code over a network, compromising the integrity of affected systems. It is imperative for users to stay informed and apply the necessary security patches to mitigate risks associated with this vulnerability.

Affected Version(s)

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.9115

Windows 11 version 26H1 ARM64-based Systems 10.0.28000.0 < 10.0.28000.2704

Windows Server 2019 (Server Core installation) x64-based Systems 10.0.17763.0 < 10.0.17763.9115

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.