High7.8Microsoft Server

High [CVE-2026-41088] Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-41088 affecting Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025 (Server Core installation).

CVE-2026-41088 Published May 12, 2026Updated by vendor Aug 10, 2026

CVE-2026-41088

Affected products & platforms

Microsoft ServerWindows Server

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Summary

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 named by the advisory: Windows Server 2022; Windows Server 2022, 23H2 Edition (Server Core installation); Windows Server 2025; Windows Server 2025 (Server Core installation).

Affected versions

Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7291
Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.7417
Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7079
Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7219
Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.8457
Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.8457
Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2113
Windows Server 2022 10.0.20348.0 before 10.0.20348.5139
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 before 10.0.25398.2330
Windows Server 2025 10.0.26100.0 before 10.0.26100.32860
Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.32860

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions

10.0.19044.7291
10.0.19045.7417
10.0.22631.7079
10.0.22631.7219
10.0.26100.8457
10.0.26200.8457
10.0.28000.2113
10.0.20348.5139
10.0.25398.2330
10.0.26100.32860

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: 10.0.19044.7291, 10.0.19045.7417, 10.0.22631.7079, 10.0.22631.7219, 10.0.26100.8457, 10.0.26200.8457. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Discussion(0)

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