---
id: CVE-2026-66802
title: Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability
summary: >-
  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.
severity: high
cvss: 8.1
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-362
  - CWE-416
vendor: Microsoft
product: Windows 10 Version 1809
affected:
  - windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9121
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2704
  - windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121
  - >-
    windows_server_2019_server_core_installation >= 10.0.17763.0 <
    10.0.17763.9121
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.33296
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-06T00:00:00+00:00'
published: '2026-08-11'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:47:13.682Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-66802'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66802'
    label: >-
      Windows Device Health Attestation (DHA) Remote Code Execution
      Vulnerability
tags:
  - cve.org
epss: 0.0036
epssPercentile: 0.29801
ingestedAt: '2026-09-08T18:07:34.888Z'
---

## Overview

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.

## Affected

- `windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2704`
- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499`
- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296`
- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33296`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.