HIGH 7.8 Microsoft
CVE-2026-20860
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Microsoft Security Update 2026-Jan: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Affected Products
- Windows 10 Version 1809 for 32-bit Systems
- Windows 10 Version 1809 for x64-based Systems
- Windows Server 2019
- Windows Server 2019 (Server Core installation)
- Windows Server 2022
- Windows Server 2022 (Server Core installation)
- Windows 10 Version 21H2 for 32-bit Systems
- Windows 10 Version 21H2 for ARM64-based Systems
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20860
- https://nvd.nist.gov/vuln/detail/CVE-2026-20860
This high severity vulnerability with a CVSS score of 7.8 was published on 2026-01-13 via Microsoft. EPSS score: 8.4% (top 5% of all CVEs by exploitation probability). Affected: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 5 more.
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