HIGH Published October 13, 2026

CVE-2026-83674

Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

CVSS base score

8.1 (v3.1)

Severity

HIGH

Attack vector

Network

Weakness

CWE-1390

Last modified

October 29, 2026

CVSS vector

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

Affected products

microsoft windows 10 1607 microsoft windows 10 1809 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-2026-83674

Affected products

References

More microsoft vulnerabilities

Published the same day

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