Check Point Advisories

Microsoft Windows Cloud Files Mini Filter Driver Elevation of Privilege (CVE-2026-33835)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-3702
Date Published:	12 May 2026
Severity:	High
Last Updated:	Tuesday 12 May, 2026
Source:	Microsoft CVE-2026-33835
Industry Reference:	CVE-2026-33835
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Windows Server 2019 Microsoft Windows Server 2022 Microsoft Windows 10 Version 1809 for 32-bit Systems Microsoft Windows 10 Version 1809 for x64-based Systems Microsoft Windows Server 2022 (Server Core installation) Microsoft Windows Server 2019 (Server Core installation) Microsoft Windows 10 Version 21H2 for ARM64-based Systems Microsoft Windows 10 Version 21H2 for 32-bit Systems Microsoft Windows 10 Version 21H2 for x64-based Systems Microsoft Windows 10 Version 22H2 for x64-based Systems Microsoft Windows 10 Version 22H2 for ARM64-based Systems Microsoft Windows 10 Version 22H2 for 32-bit Systems Microsoft Windows Server 2025 (Server Core installation) Microsoft Windows 11 Version 25H2 for ARM64-based Systems Microsoft Windows 11 Version 23H2 for ARM64-based Systems Microsoft Windows 11 Version 25H2 for x64-based Systems Microsoft Windows 11 Version 24H2 for ARM64-based Systems Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) Microsoft Windows 11 Version 24H2 for x64-based Systems Microsoft Windows 11 Version 23H2 for x64-based Systems Microsoft Windows Server 2025 Microsoft Windows 11 version 26H1 for x64-based Systems Microsoft Windows 11 Version 26H1 for ARM64-based Systems
Vulnerability Description	Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Microsoft Windows Cloud Files Mini Filter Driver Elevation of Privilege (CVE-2026-33835) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Windows SMB Protection Violation.
Attack Information: Microsoft Windows Cloud Files Mini Filter Driver Elevation of Privilege (CVE-2026-33835)