High7.0Microsoft Server Updated
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-45603 Published Jun 9, 2026
Affected products & platforms
Microsoft ServerWindows Server
Summary
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 2 more. Affected products named by the advisory: Windows Server 2012 R2.
Fixed versions
- KB5094123 (build 10.0.17763.8880)
- KB5094128 (build 10.0.20348.5256)
- KB5094127 (build 10.0.19045.7417)
- KB5094125 (build 10.0.26100.32995)
- KB5094126 (build 10.0.26100.8655)
- KB5093998 (build 10.0.22631.7219)
- KB5095051 (build 10.0.28000.2269)
- KB5094122 (build 10.0.14393.9234)
Official advisory · high-confidence parse· fetched 7 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Install the applicable security update for your platform: KB5094123, KB5094128, KB5094127, KB5094125, KB5094126, KB5093998 (see the Microsoft Update Catalog).
Official advisory · high-confidence parse· fetched 7 hours ago·verify at source
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