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Microsoft has confirmed a known issue in which recent Microsoft Defender Antivirus updates trigger false "Microsoft Defender Antivirus is turned off" alerts in the Windows Security app, even though the antivirus is running normally. The bug affects all supported Windows client and server versions, including Windows 11 26H1 and Windows Server 2025, and a fix is still pending.
Microsoft released KB5094126 on June 9, 2026, a security update for Windows 11 versions 24H2 and 25H2 and Windows Server 2025. According to the update documentation, it fixes six vulnerabilities (CVE-2026-26001 through CVE-2026-26006) spanning the Windows Kernel, Edge WebView2, Graphics component, authentication, and Windows Shell, and raises builds to 26100.8655 (24H2) and 26200.8655 (25H2).
Microsoft's June 2026 security update KB5094125 patches five vulnerabilities in Windows Server 2025, including a critical unauthenticated Remote Desktop Services RCE (CVE-2026-0235) and a Hyper-V guest-to-host escape (CVE-2026-0237). The update raises the OS build to 26100.32995 and applies to all editions across full GUI and Server Core installations.
Microsoft released KB5087539 on May 12, 2026, a security update for Windows Server 2025 that patches remote code execution, privilege escalation and information disclosure flaws across the kernel, Active Directory Domain Services and Remote Desktop Services. The update raises the OS build to 26100.32860 and applies to Standard and Datacenter editions in both Desktop Experience and Server Core.
Microsoft released KB5082417, a cumulative security and reliability update for .NET Framework 3.5 and 4.8.1 on Windows 11 25H2 and Windows Server 2025. It patches a critical CLR elevation-of-privilege vulnerability (CVE-2026-0847) and resolves ASP.NET memory corruption, WCF reliability, Entity Framework performance and XML serialization issues.
Microsoft released KB5082063 on April 14, 2026, a security update for Windows 11 24H2 and Windows Server 2025 patching 6 CVEs including kernel EoP, TCP/IP RCE, Hyper-V escape, and auth token manipulation.
