Use-after-free in Microsoft Windows and Windows Server - CVE-2026-69366

Vulnerability identifier: #VU147631

CSH Severity: Low

CVSS v4: 7.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-69366

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to elevate privileges.

The vulnerability exists due to use-after-free in the Windows Kernel when exploiting a race condition over a network. A remote user can win the race condition to elevate privileges.

Successful exploitation could grant SYSTEM privileges. User interaction is required.

Microsoft Windows
Windows Server

Install security update from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7725, 10 22H2 10.0.19045.7725, 10 1607 10.0.14393.9512, 10 1809 10.0.17763.9245, 11 23H2 10.0.22631.7582, 11 24H2 10.0.26100.9445, 11 25H2 10.0.26200.9445, 11 26H1 10.0.28000.2954
Windows Server - addressed in versions 2012 R2 6.3.9600.23397, 2012 6.2.9200.26349, 2016 10.0.14393.9512, 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-69366
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69366

• Multiple vulnerabilities in Microsoft Windows