Vulnerability in Microsoft Windows 10 Version 1607
CVE-2026-83674
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows Server 2016
- Microsoft Windows Server 2016 (Server Core Installation)
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core Installation)
- Microsoft Windows Server 2022
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core Installation)
Weakness classification (CWE)
References
- Active Directory Federation Services (AD FS) Spoofing Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-83674?
- CVE-2026-83674 is a high-severity vulnerability in Microsoft Windows 10 Version 1607, classified under Weak Authentication. CVSS score: 8.1/10. Published 2026-10-13.
- How severe is CVE-2026-83674?
- High severity. CVSS v3 base score is 8.1 out of 10.