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CVE-2026-83674

HighCVSS 8.1/10Last modified Oct 29, 2026

Description

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

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 10 Version 1607	>= 10.0.14393.0, < 10.0.14393.9612
Microsoft	Windows 10 Version 1809	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2016	>= 10.0.14393.0, < 10.0.14393.9612
Microsoft	Windows Server 2016 (Server Core installation)	>= 10.0.14393.0, < 10.0.14393.9612
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5761
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.33650
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.33650

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83674Vendor Advisory, Patch

Timeline

Published: Oct 13, 2026
Last modified: Oct 29, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-836757.0Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.CVE-2026-836767.0Integer underflow (wrap or wraparound) in Windows Installer allows an authorized attacker to elevate privileges locally.CVE-2026-836777.5Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over a network.CVE-2026-836787.8Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.CVE-2026-836797.8Use after free in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.CVE-2026-83686.5LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects. On a 3xx respons CVE-2026-836807.0Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.CVE-2026-836815.5Weak authentication in Microsoft PowerToys allows an authorized attacker to perform tampering locally.CVE-2026-836827.0Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges locally.CVE-2026-836836.5Absolute path traversal in Windows Encrypting File System (EFS) allows an authorized attacker to disclose information over a network.CVE-2026-836847.5Buffer over-read in Windows iSCSI Target Service allows an unauthorized attacker to disclose information over a network.CVE-2026-836856.5Buffer over-read in Windows IKE Extension allows an authorized attacker to deny service over a network.

CVE-2026-83674: High severity, CVSS 8.1 | Vulnix