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Roughly 400 vulnerabilities, including 42 Critical flaws and three zero-days.

Microsoft

Microsoft's August 2026 Patch Tuesday Fixes About 400 Flaws and 3 Zero-Days

Microsoft's August 2026 Patch Tuesday addresses roughly 400 vulnerabilities, including 42 rated Critical and three zero-days. One, CVE-2026-68820, is already exploited in the wild and now sits in CISA's KEV catalog.

Aug 28, 2026, 7:51 PM 7 min high severity

EEmanuel De Almeida

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Microsoft

Microsoft June 2026 Patch Tuesday: KB5093998 Fixes 7 Flaws in Windows 11 23H2 Including Actively Exploited Kernel Bug

Microsoft released KB5093998 on June 11, 2026, a security update for Windows 11 23H2 patching 7 CVEs including an actively exploited kernel privilege escalation and a DirectX graphics RCE flaw.

Jun 12, 2026, 12:30 AM 3 min critical severity

EEmanuel De Almeida

Microsoft

Microsoft June 2026 Patch Tuesday: KB5094127 Fixes Actively Exploited Kernel Flaw in Windows 10 22H2

Microsoft released KB5094127 on June 11, 2026, a security update for Windows 10 22H2 patching CVE-2026-0234 (kernel EoP), CVE-2026-0235 (RDP RCE), CVE-2026-0236 (graphics info disclosure), and CVE-2026-0237 (WebView2 bypass).

Jun 12, 2026, 12:30 AM 3 min critical severity

EEmanuel De Almeida

Microsoft update KB5097149, which patches a SignalR denial-of-service flaw and a .NET SDK elevation-of-privilege.

dotNET

KB5097149 Patches SignalR DoS and SDK EoP in .NET 8.0.28

KB5097149 patches three CVEs in .NET 8.0: serialization RCE, ASP.NET Core DoS, and cryptographic info disclosure. Updates to version 8.0.28 on Windows, Linux, and macOS. No known issues.

Jun 10, 2026, 1:30 AM 2 min high severity

EEmanuel De Almeida

Update KB5087420, which fixes an RDP certificate warning and delivers the May Patch Tuesday security improvements.

Windows 11

KB5087420 Fixes RDP Warning and Delivers May Patch Tuesday for Windows 11 23H2

KB5087420 is the May 2026 Patch Tuesday update for Windows 11 23H2 (Build 22631.7079). Fixes the RDP multi-monitor warning issue from KB5082052, includes Secure Boot cert targeting improvements, and addresses BitLocker recovery behavior.

May 13, 2026, 2:00 AM 2 min medium severity

EEmanuel De Almeida

Microsoft update KB5087058, which patches two .NET Framework elevation-of-privilege vulnerabilities affecting Windows 11.

Patch Tuesday

KB5087058 Patches Two .NET Framework EoP Flaws on Windows 11 23H2

KB5087058 patches CVE-2026-32177 and CVE-2026-35433 (both .NET Framework EoP) on Windows 11 23H2. May 2026 Patch Tuesday security update for .NET Framework 3.5 and 4.8.1. No known issues.

May 13, 2026, 2:00 AM 2 min medium severity

EEmanuel De Almeida

Microsoft

Microsoft May 2026 Patch Tuesday: KB5087537 Fixes RDP RCE and Kernel Flaws in Windows 10 1607 and Server 2016

Microsoft released KB5087537 on May 12, 2026, a security update for Windows 10 1607 and Windows Server 2016 addressing kernel EoP, RDP RCE, GDI flaws, MSMQ RCE, and Print Spooler vulnerabilities. Build 14393.9140.

May 12, 2026, 10:00 PM 4 min critical severity

EEmanuel De Almeida