CVE-2026-83666 in Windows

Summary

by MITRE • 10/14/2026

Concurrent execution using shared resource with improper synchronization ('race condition') in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges locally.

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• Responsible: Microsoft
• Reservation: 09/01/2026
• Disclosure: 10/14/2026
• Moderation: accepted
• Entry: VDB-418729
• CPE: 20261014
• CWE: CWE-362 (confirmed)
• CVSS: 7.0 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Chemical, Hospital, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-83666
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-83666
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-83666/