MSRC_CVE-2026-66802
Vulnerability from csaf_microsoft - Published: 2026-08-11 07:00 - Updated: 2026-08-20 07:00Summary
Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability
Severity
Critical
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CWE-362
- Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected products
Fixed
10 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.9121
Windows 10 Version 1809 for 32-bit Systems
|
10.0.17763.9121 | ||
|
Windows 10 Version 1809 for x64-based Systems 10.0.17763.9121
Windows 10 Version 1809 for x64-based Systems
|
10.0.17763.9121 | ||
|
Windows Server 2019 10.0.17763.9121
Windows Server 2019
|
10.0.17763.9121 | ||
|
Windows Server 2019 (Server Core installation) 10.0.17763.9121
Windows Server 2019 (Server Core installation)
|
10.0.17763.9121 | ||
|
Windows Server 2022 10.0.20348.5499
Windows Server 2022
|
10.0.20348.5499 | ||
|
Windows Server 2022 (Server Core installation) 10.0.20348.5499
Windows Server 2022 (Server Core installation)
|
10.0.20348.5499 | ||
|
Windows Server 2025 10.0.26100.33296
Windows Server 2025
|
10.0.26100.33296 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.33296
Windows Server 2025 (Server Core installation)
|
10.0.26100.33296 | ||
|
Windows 11 version 26H1 for x64-based Systems 10.0.28000.2704
Windows 11 version 26H1 for x64-based Systems
|
10.0.28000.2704 | ||
|
Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.2704
Windows 11 Version 26H1 for ARM64-based Systems
|
10.0.28000.2704 |
Known affected
10 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows 11 Version 26H1 for ARM64-based Systems <10.0.28000.2704
Windows 11 Version 26H1 for ARM64-based Systems
|
<10.0.28000.2704 |
Vendor Fix
fix
|
|
|
Windows 11 version 26H1 for x64-based Systems <10.0.28000.2704
Windows 11 version 26H1 for x64-based Systems
|
<10.0.28000.2704 |
Vendor Fix
fix
|
|
|
Windows Server 2025 (Server Core installation) <10.0.26100.33296
Windows Server 2025 (Server Core installation)
|
<10.0.26100.33296 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.33296
Windows Server 2025
|
<10.0.26100.33296 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2022 (Server Core installation) <10.0.20348.5499
Windows Server 2022 (Server Core installation)
|
<10.0.20348.5499 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2022 <10.0.20348.5499
Windows Server 2022
|
<10.0.20348.5499 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2019 (Server Core installation) <10.0.17763.9121
Windows Server 2019 (Server Core installation)
|
<10.0.17763.9121 |
Vendor Fix
fix
|
|
|
Windows Server 2019 <10.0.17763.9121
Windows Server 2019
|
<10.0.17763.9121 |
Vendor Fix
fix
|
|
|
Windows 10 Version 1809 for x64-based Systems <10.0.17763.9121
Windows 10 Version 1809 for x64-based Systems
|
<10.0.17763.9121 |
Vendor Fix
fix
|
|
|
Windows 10 Version 1809 for 32-bit Systems <10.0.17763.9121
Windows 10 Version 1809 for 32-bit Systems
|
<10.0.17763.9121 |
Vendor Fix
fix
|
Threats
Impact
Remote Code Execution
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
References
7 references
{
"document": {
"acknowledgments": [
{
"names": [
"Anonymous"
]
}
],
"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Critical"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
},
{
"category": "general",
"text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
"title": "Customer Action"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-66802 Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66802"
},
{
"category": "self",
"summary": "CVE-2026-66802 Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-66802.json"
},
{
"category": "external",
"summary": "Microsoft Exploitability Index",
"url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability",
"tracking": {
"current_release_date": "2026-08-20T07:00:00.000Z",
"generator": {
"date": "2026-08-20T14:01:49.115Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-66802",
"initial_release_date": "2026-08-11T07:00:00.000Z",
"revision_history": [
{
"date": "2026-08-11T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
},
{
"date": "2026-08-20T07:00:00.000Z",
"legacy_version": "1.1",
"number": "2",
"summary": "Corrected the Executive Summary to clarify that the vulnerability affects Windows Device Health Attestation (DHA), not Microsoft Azure Attestation. This is an informational change only."
}
],
"status": "final",
"version": "2"
}
},
"product_tree": {
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"product_id": "9"
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{
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{
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"product_id": "6"
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},
{
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"product_id": "5"
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},
{
"category": "product_version",
"name": "10.0.20348.5499",
"product": {
"name": "Windows Server 2022 (Server Core installation) 10.0.20348.5499",
"product_id": "11924"
}
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],
"category": "product_name",
"name": "Windows Server 2022 (Server Core installation)"
},
{
"branches": [
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"category": "product_version_range",
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"product_id": "3"
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{
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"product_id": "4"
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},
{
"category": "product_version",
"name": "10.0.26100.33296",
"product": {
"name": "Windows Server 2025 10.0.26100.33296",
"product_id": "12436"
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{
"branches": [
{
"category": "product_version_range",
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"product_id": "2"
}
},
{
"category": "product_version",
"name": "10.0.28000.2704",
"product": {
"name": "Windows 11 version 26H1 for x64-based Systems 10.0.28000.2704",
"product_id": "20853"
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"category": "product_name",
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"product_id": "1"
}
},
{
"category": "product_version",
"name": "10.0.28000.2704",
"product": {
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"product_id": "20854"
}
}
],
"category": "product_name",
"name": "Windows 11 Version 26H1 for ARM64-based Systems"
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},
"vulnerabilities": [
{
"cve": "CVE-2026-66802",
"cwe": {
"id": "CWE-362",
"name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "Successful exploitation of this vulnerability requires an attacker to win a race condition.",
"title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
},
{
"category": "faq",
"text": "An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.",
"title": "How could an attacker exploit this vulnerability?"
}
],
"product_status": {
"fixed": [
"11568",
"11569",
"11571",
"11572",
"11923",
"11924",
"12436",
"12437",
"20853",
"20854"
],
"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-66802 Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66802"
},
{
"category": "self",
"summary": "CVE-2026-66802 Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-66802.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-11T07:00:00.000Z",
"details": "10.0.17763.9121:Security Update:https://support.microsoft.com/help/5120238",
"product_ids": [
"10",
"9",
"8",
"7"
],
"url": "https://support.microsoft.com/help/5120238"
},
{
"category": "vendor_fix",
"date": "2026-08-11T07:00:00.000Z",
"details": "10.0.20348.5499:Security Update:https://support.microsoft.com/help/5120242",
"product_ids": [
"6",
"5"
],
"url": "https://support.microsoft.com/help/5120242"
},
{
"category": "vendor_fix",
"date": "2026-08-11T07:00:00.000Z",
"details": "10.0.20348.5440:Security Hotpatch Update:https://support.microsoft.com/help/5120229",
"product_ids": [
"6",
"5"
],
"url": "https://support.microsoft.com/help/5120229"
},
{
"category": "vendor_fix",
"date": "2026-08-11T07:00:00.000Z",
"details": "10.0.26100.33296:Security Update:https://support.microsoft.com/help/5120233",
"product_ids": [
"3",
"4"
],
"url": "https://support.microsoft.com/help/5120233"
},
{
"category": "vendor_fix",
"date": "2026-08-11T07:00:00.000Z",
"details": "10.0.26100.33222:Security Hotpatch Update:https://support.microsoft.com/help/5120228",
"product_ids": [
"3",
"4"
],
"url": "https://support.microsoft.com/help/5120228"
},
{
"category": "vendor_fix",
"date": "2026-08-11T07:00:00.000Z",
"details": "10.0.28000.2704:Security Update:https://support.microsoft.com/help/5121000",
"product_ids": [
"2",
"1"
],
"url": "https://support.microsoft.com/help/5121000"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 7.1,
"userInteraction": "NONE",
"vectorString": "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",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10"
]
}
],
"threats": [
{
"category": "impact",
"details": "Remote Code Execution"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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