CVE-2026-26176

| EUVD-2026-22414 HIGH
2026-04-14 microsoft GHSA-9cr5-9f63-xhxx
Heap Overflow Buffer Overflow Microsoft Windows 10 Version 1607 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 2012 Windows Server 2012 Server Core Installation Windows Server 2012 R2 Windows Server 2012 R2 Server Core Installation Windows Server 2016 Windows Server 2016 Server Core Installation 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
Temporal: 6.8
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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 - 19:27 vuln.today

DescriptionNVD

Heap-based buffer overflow in Windows Client Side Caching driver (csc.sys) allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in Windows Client Side Caching driver (csc.sys) allows authenticated users with low privileges to gain SYSTEM-level access via heap-based buffer overflow exploitation. Affects all supported Windows 10, Windows 11, and Windows Server versions (2012 through 2025). …

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RemediationAI

Within 24 hours: Identify all Windows 10, Windows 11, and Windows Server 2012-2025 systems in your environment and confirm current patch levels. Within 7 days: Apply Microsoft-released patches for CVE-2026-26176 to all affected systems using your standard patch management process; prioritize servers and high-value endpoints first. …

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CVE-2026-26176 vulnerability details – vuln.today
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