CVE-2026-66802

Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability

HIGH

8.1

CVSS Score

Published: August 11, 2026 at 05:07 PM UTC

Updated: October 28, 2026 at 08:08 PM UTC

5 products affected across 1 vendorWindows Server 2019Windows 10 1809Windows Server 2022

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Severity

HIGH8.1

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 1809 · Microsoft

95%

v < 10.0.17763.912110.0.17763.0

Affected range stops below 10.0.17763.9121, so it looks safe — our inference, not a vendor statement

Windows 11 26H1 · Microsoft

95%

v < 10.0.28000.270410.0.28000.0

Affected range stops below 10.0.28000.2704, so it looks safe — our inference, not a vendor statement

Windows Server 2019 · Microsoft

95%

v < 10.0.17763.912110.0.17763.0

Affected range stops below 10.0.17763.9121, so it looks safe — our inference, not a vendor statement

Windows Server 2022 · Microsoft

95%

v < 10.0.20348.544010.0.20348.0

Affected range stops below 10.0.20348.5440, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.0.20348.5499, so it looks safe — our inference, not a vendor statement

Windows Server 2025 · Microsoft

95%

v < 10.0.26100.3322210.0.26100.0

Affected range stops below 10.0.26100.33222, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.0.26100.33296, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66802

References (1)

Vendor AdvisoryPatch

Source: cverecord

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66802

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGH[email protected]

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-362CWE-416

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