Microsoft Defender "ShieldCrash" Zero-Day Bypasses September 2026 Patch, SYSTEM File Read Confirmed on All Windows Versions

Scope: Microsoft Defender for Windows (All Versions on Windows 10, Windows 11, Windows Server 2025 and All Supported Versions)

Severity: Red

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Microsoft Exchange Server Unauthenticated Network Remote Code Execution via Double-Free Vulnerability (CVE-2026-55007)

Scope: Microsoft Exchange Server (All Supported On-Premises Versions Prior to September 2026 Cumulative Update)

Severity: High

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ConnectWise ScreenConnect Authentication Bypass Under Active Exploitation Grants Full Remote Control of Managed Endpoints (CVE-2026-77924)

Scope: ConnectWise ScreenConnect (All Versions Prior to Latest Patched Release)

Severity: Red

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MikroTik RouterOS "MikroTrick" Authentication Bypass Chain Seizes Devices Without Credentials (CVE-2026-67277 / CVE-2026-86060)

Scope: MikroTik RouterOS (All Versions Affected by Both CVEs, Prior to Latest Stable Release)

Severity: Red

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Google Chrome V8 Type Confusion Zero-Day Under Active Exploitation Added to CISA KEV (CVE-2026-85046)

Scope: Google Chrome Prior to Version 152.0.7977.82 and All Chromium-Based Browsers Including Microsoft Edge, Brave, and Opera

Severity: High

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Windows Update Stack and ALPC Actively Exploited Zero-Days from Record September 2026 Patch Tuesday (CVE-2026-81963 / CVE-2026-85880)

Scope: Windows 10, Windows 11, Windows Server 2019, 2022, and 2025 (All Supported Versions)

Severity: Red

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