HIGH Published October 13, 2026

CVE-2026-83666

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.

CVSS base score

7.0 (v3.1)

Severity

HIGH

Attack vector

Local

Weakness

CWE-362

Last modified

October 29, 2026

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

microsoft windows 10 1607 microsoft windows 10 1809 microsoft windows server 2012 microsoft windows server 2016 microsoft windows server 2019 microsoft windows server 2022 microsoft windows server 2025

References

msrc.microsoft.com Vendor Advisory, Patch

View full NVD advisory →

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CVE-2026-83666

Affected products

References

More microsoft vulnerabilities

Published the same day

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