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OpenAdvisories
High · 8.8 CVE-2026-69918 EUVD-2026-99107GHSA-3697-c7vq-r589

Windows Core Messaging Elevation of Privilege Vulnerability

Published Oct 13, 2026 · Updated Nov 10, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows 10 Version 1607 Product: Windows 10 Version 1809 Product: Windows 10 Version 21H2 Product: Windows 10 Version 22H2 Product: Windows 11 version 23H2 Product: Windows 11 Version 24H2 Product: Windows 11 Version 25H2 Product: Windows 11 version 26H1 Product: Windows 11 Version 26H2 Product: Windows Server 2016 Product: Windows Server 2016 (Server Core installation) Product: Windows Server 2019 Product: Windows Server 2019 (Server Core installation) Product: Windows Server 2022 Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges locally.

Affected products

VendorProductAffectedFixed
Microsoft Windows 10 Version 1607 10.0.14393.0 – < 10.0.14393.9612 10.0.14393.9612
Microsoft Windows 10 Version 1809 10.0.17763.0 – < 10.0.17763.9376 10.0.17763.9376
Microsoft Windows 10 Version 21H2 10.0.19044.0 – < 10.0.19044.7807 10.0.19044.7807
Microsoft Windows 10 Version 22H2 10.0.19045.0 – < 10.0.19045.7807 10.0.19045.7807
Microsoft Windows 11 version 23H2 10.0.22631.0 – < 10.0.22631.7652 10.0.22631.7652
Microsoft Windows 11 Version 24H2 10.0.26100.0 – < 10.0.26100.9711 10.0.26100.9711
Microsoft Windows 11 Version 25H2 10.0.26200.0 – < 10.0.26200.9711 10.0.26200.9711
Microsoft Windows 11 version 26H1 10.0.28000.0 – < 10.0.28000.3231 10.0.28000.3231
Microsoft Windows 11 Version 26H2 10.0.26300.0 – < 10.0.26300.9711 10.0.26300.9711
Microsoft Windows Server 2016 10.0.14393.0 – < 10.0.14393.9612 10.0.14393.9612
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 – < 10.0.14393.9612 10.0.14393.9612
Microsoft Windows Server 2019 10.0.17763.0 – < 10.0.17763.9376 10.0.17763.9376
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 – < 10.0.17763.9376 10.0.17763.9376
Microsoft Windows Server 2022 10.0.20348.0 – < 10.0.20348.5761 10.0.20348.5761
Microsoft Windows Server 2025 10.0.26100.0 – < 10.0.26100.33650 10.0.26100.33650
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 – < 10.0.26100.33650 10.0.26100.33650

Advisories 1

References