Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows and Windows Server - CVE-2026-119974
Published: November 11, 2026
Vulnerability identifier: #VU165391
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-119974
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges locally.
The vulnerability exists due to a time-of-check time-of-use (TOCTOU) race condition in Windows Cloud Files Mini Filter Driver when a resource's state changes between validation and use. A local user can exploit the timing window between a check and a subsequent operation to escalate privileges locally.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-119974
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7846, 10 22H2 10.0.19045.7846, 10 1809 10.0.17763.9487, 11 23H2 10.0.22631.7711, 11 24H2 10.0.26100.9911, 11 24H2 10.0.26100.9974, 11 25H2 10.0.26200.9911, 11 25H2 10.0.26200.9974, 11 26H1 10.0.28000.3501
Windows Server - addressed in versions 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822
Windows Server - addressed in versions 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822