Windows CVE-2026-20816
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Time-of-check time-of-use (toctou) race condition in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Windows Installer contains a time-of-check time-of-use race condition that allows authenticated local attackers to escalate privileges on Windows 10 1809, Windows 11 25h2, and Windows Server 2022 23h2. An attacker with local access can exploit the window between permission validation and file operation execution to gain elevated system access. …
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RemediationAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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