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CVE-2026-83909

Windows Win32 Kernel Subsystem Information Disclosure Vulnerability

Exposure of sensitive system information to an unauthorized control sphere in Windows Win32 Kernel Subsystem allows an authorized attacker to disclose information locally.

CVSS 3.1 · 4.7 Medium EPSS < 1% KEV · Not listed
Vendors
Microsoft
Products
Windows 10 1607 Windows 10 1809 Windows 10 21h2 and 25 more
CVE-2026-83645

Active Directory Federation Services (AD FS) Denial of Service Vulnerability

Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed
Vendors
Microsoft
Products
Windows 10 1607 Windows 10 1809 Windows Server 2012 and 11 more
CVE-2026-83646

Active Directory Federation Services (AD FS) Spoofing Vulnerability

Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Microsoft
Products
Windows 10 1607 Windows 10 1809 Windows Server 2016 and 6 more
CVE-2026-83933

Windows Update Orchestrator Service Information Disclosure Vulnerability

Improper link resolution before file access ('link following') in Windows Update Orchestrator Service allows an authorized attacker to disclose information locally.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Microsoft
Products
Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 and 14 more