CVE-2026-27927

| EUVD-2026-22479 HIGH
2026-04-14 microsoft GHSA-xmhh-m2j3-cr44
Information Disclosure Race Condition Microsoft Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows 11 Version 22H3 Windows 11 Version 23H2 Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2019 Windows Server 2019 Server Core Installation Windows Server 2022 Windows Server 2022 23H2 Edition Server Core Installation Windows Server 2025 Windows Server 2025 Server Core Installation
7.8
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
Analysis Generated
Apr 14, 2026 - 19:17 vuln.today

DescriptionNVD

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Projected File System allows an authorized attacker to elevate privileges locally.

AnalysisAI

Privilege escalation in Windows Projected File System across Windows 10, 11, and Server versions allows authenticated local users to gain SYSTEM-level privileges by exploiting a race condition during concurrent file system operations. Affects all currently supported Windows versions from Server 2019 through Windows 11 26H1. …

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RemediationAI

Within 24 hours: Identify all Windows 10, Windows 11, and Windows Server 2019+ systems in your environment using IT asset management tools. Within 7 days: Deploy Microsoft's latest security update containing the CVE-2026-27927 patch to test systems; verify compatibility with critical applications. …

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CVE-2026-27927 vulnerability details – vuln.today
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