Unrated severityNVD Advisory· Published Jan 13, 2026· Updated Apr 1, 2026
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-20860
Description
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected products
2510.0.14393.0+ 2 more
- (no CPE)range: 10.0.14393.0
- (no CPE)range: 10.0.19044.0
- (no CPE)range: 10.0.19045.0
- Range: 10.0.17763.0
- Microsoft/Windows 11 version 22H3v5Range: 10.0.22631.0
- Range: 10.0.22631.0
- Range: 10.0.26100.0
- Range: 10.0.26200.0
6.1.7601.0+ 1 more
- (no CPE)range: 6.1.7601.0
- (no CPE)range: 6.0.6003.0
- Microsoft/Windows Server 2008 R2 Service Pack 1 (Server Core installation)v5Range: 6.1.7601.0
- Microsoft/Windows Server 2008 Service Pack 2 (Server Core installation)v5Range: 6.0.6003.0
6.2.9200.0+ 1 more
- (no CPE)range: 6.2.9200.0
- (no CPE)range: 6.3.9600.0
- Microsoft/Windows Server 2012 R2 (Server Core installation)v5Range: 6.3.9600.0
- Microsoft/Windows Server 2012 (Server Core installation)v5Range: 6.2.9200.0
- Range: 10.0.14393.0
- Microsoft/Windows Server 2016 (Server Core installation)v5Range: 10.0.14393.0
- Range: 10.0.17763.0
- Microsoft/Windows Server 2019 (Server Core installation)v5Range: 10.0.17763.0
- Range: 10.0.20348.0
- Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation)v5Range: 10.0.25398.0
- Range: 10.0.26100.0
- Microsoft/Windows Server 2025 (Server Core installation)v5Range: 10.0.26100.0
Patches
Vulnerability mechanics
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20860mitrevendor-advisorypatch
News mentions
1- U.S. Public Sector Under Siege: Threat Intelligence for Q1 2026Trend Micro Research · Apr 9, 2026