EUVD-2026-56746
GHSA-xp2p-9v56-q74x
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Race condition requires precise timing to exploit (AC:H); attestation endpoint is network-exposed with no authentication gate (AV:N, PR:N); full compromise of the attestation process is plausible (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Remote code execution is possible in Microsoft Azure Attestation and the Device Health Attestation Service due to a race condition (CWE-362) in shared resource handling. An unauthenticated network attacker who can win a precise timing window can achieve full confidentiality, integrity, and availability compromise of the affected service. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:N/AC:H/PR:N/UI:N) indicates network-accessible exploitation requiring no authentication and no user interaction, but with high attack complexity - meaning the race condition window must be reliably won, likely requiring concurrent or rapid repeated requests. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score reflects high impact (C:H/I:H/A:H) tempered by high attack complexity (AC:H), which is appropriate for a race condition requiring precise timing to exploit reliably. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Consult the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66802 for patch status and any required customer action. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of Microsoft Azure Attestation and Device Health Attestation Service deployments across your environment and enable enhanced logging and monitoring specifically for these services; immediately review access logs from the past 90 days for indicators of exploitation or suspicious timing-based activity patterns. …
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External POC / Exploit Code
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