CVE-2026-26166

| EUVD-2026-22394 HIGH
2026-04-14 microsoft
Information Disclosure Microsoft Windows 11 Version 22H3 Windows 11 Version 23H2 Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2022 Windows Server 2022 23H2 Edition Server Core Installation Windows Server 2025 Windows Server 2025 Server Core Installation
7.0
CVSS 3.1
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CVSS VectorNVD

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

Lifecycle Timeline

1
Analysis Generated
Apr 14, 2026 - 19:13 vuln.today

DescriptionNVD

Double free in Windows Shell allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in Windows Shell via double-free memory corruption allows low-privileged authenticated users to gain SYSTEM-level access across Windows 11 (versions 22H3 through 26H1) and Windows Server 2022/2025 environments. The CWE-415 double-free vulnerability requires high attack complexity but no user interaction, enabling complete system compromise once exploited. …

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RemediationAI

Within 24 hours: Identify all Windows 11 (22H3-26H1) and Windows Server 2022/2025 systems in your environment and verify current patch status. Within 7 days: Deploy vendor-released patches to all affected systems-prioritize domain controllers, critical servers, and systems with elevated access requirements first. …

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CVE-2026-26166 vulnerability details – vuln.today
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