EUVD-2026-22451
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows User Interface Core allows an authorized attacker to elevate privileges locally.
AnalysisAI
Race condition in Windows User Interface Core (MSRC patch CVE-2026-27911) enables low-privileged authenticated attackers to elevate privileges to SYSTEM level on Windows 10, Windows 11, and Windows Server 2016-2025 systems. The flaw stems from improper synchronization when multiple threads concurrently access shared resources in the UI subsystem, creating a time-of-check-time-of-use (TOCTOU) window exploitable for privilege escalation. …
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RemediationAI
Within 24 hours: Inventory all Windows 10, Windows 11, Windows Server 2016, 2019, 2022, and 2025 systems in your environment and prioritize servers and workstations with critical or sensitive data access. Within 7 days: Apply Microsoft's CVSS 7.8 patch for CVE-2026-27911 to all affected systems, beginning with high-value assets and domain controllers; verify patch installation via Windows Update or WSUS. …
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External POC / Exploit Code
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