Zscaler protects against 10 new vulnerabilities for Windows

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 10 vulnerabilities included in June 2026 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the June release and deploy additional protections, as necessary.

CVE-2026-41091 – Microsoft Defender Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Microsoft Malware Protection Engine

CVE-2026-42905 – Windows DWM Core Library Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 (Server Core installation)
• Windows Server 2012
• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems

CVE-2026-42980 – NT OS Kernel Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows 10 Version 1607 for 32-bit Systems
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows 11 Version 26H1 for x64-based Systems - extra
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 (Server Core installation)
• Windows Server 2012
• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 10 Version 1607 for x64-based Systems

CVE-2026-42986 – Microsoft Graphics Component Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 (Server Core installation)
• Windows Server 2012

CVE-2026-42989 – Winlogon Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 (Server Core installation)
• Windows Server 2012
• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows Server 2025
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems

CVE-2026-44803 – Windows Graphics Component Remote Code Execution Vulnerability

Severity: Critical

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows 10 Version 1607 for 32-bit Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Microsoft Word for Android
• Microsoft PowerPoint for Android
• Microsoft Excel for Android
• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 (Server Core installation)
• Windows Server 2012
• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems

CVE-2026-44812 – Windows Graphics Component Remote Code Execution Vulnerability

Severity: Critical

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Microsoft PowerPoint for Android
• Microsoft Excel for Android
• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 (Server Core installation)
• Windows Server 2012
• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Microsoft Word for Android
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems

CVE-2026-45586 – Windows Collaborative Translation Framework (CTFMON) Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 (Server Core installation)
• Windows Server 2012
• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems

CVE-2026-45658 – Windows BitLocker Security Feature Bypass Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows Server 2016 (Server Core installation)
• Windows Server 2016
• Windows 10 Version 1607 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 10 Version 22H2 for 32-bit Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows Server 2022
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems

CVE-2020-17103 – Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

• Advanced Cloud Sandbox
• Advanced Threat Protection

Affected Software

• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 11 version 26H1 for x64-based Systems
• Windows Server 2025
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows Server 2019 (Server Core installation)
• Windows Server 2019
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems