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Microsoft released fixes for 163 vulnerabilities in its April Patch Tuesday update, marking one of its largest security releases on record. The bundle includes 8 Critical flaws, 154 Important issues, and 1 Moderate bug, with seven of the Critical vulnerabilities enabling remote code execution across products and components including Windows TCP/IP, Windows IKE Service Extensions, Active Directory, Remote Desktop Client, Microsoft Office, and Microsoft Word. Belgian authorities urged organizations to apply the updates immediately.
The most urgent issues include CVE-2026-32201, an actively exploited Microsoft SharePoint Server vulnerability that was added to CISA’s Known Exploited Vulnerabilities catalog, and CVE-2026-33825 in Microsoft Defender, a publicly disclosed zero-day tied to proof-of-concept code associated with the BlueHammer exploit. Microsoft also shipped Windows 11 cumulative updates with security hardening changes, including safer handling of .rdp files and improved visibility into Secure Boot certificates, while the broader patch set addressed numerous elevation-of-privilege and security feature bypass flaws that could support post-compromise escalation.
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5 events from the most recent confirmed update back to the earliest known activity.
After Microsoft's April 2026 Patch Tuesday, Shadowserver reported that more than 1,300 internet-exposed SharePoint servers remained unpatched against CVE-2026-32201. The finding highlighted continued exposure of vulnerable SharePoint Enterprise Server 2016, SharePoint Server 2019, and Subscription Edition systems despite available fixes.
Alongside Patch Tuesday, Microsoft released Windows 11 cumulative updates containing security hardening changes. These included safer handling of .rdp files and improvements to Secure Boot certificate visibility.
Microsoft's April 2026 Patch Tuesday addressed 163 vulnerabilities, including eight Critical flaws, one publicly disclosed zero-day, and one vulnerability under active exploitation. The release was described as the second-largest Patch Tuesday on record.
CVE-2026-32201 in Microsoft SharePoint Server was added to CISA's Known Exploited Vulnerabilities Catalog after evidence of active exploitation in the wild. The designation elevated the flaw's urgency ahead of or alongside Microsoft's April 2026 fixes.
CVE-2026-33825 in Microsoft Defender was publicly disclosed with proof-of-concept code associated with the "BlueHammer" exploit. This made it one of the most urgent issues addressed in Microsoft's April 2026 security updates.
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Microsoft released fixes for **163 CVEs** across 17 product families, including **8 Critical** vulnerabilities, **1 publicly disclosed** flaw, and **1 vulnerability under active exploitation**. The exploited issue, `CVE-2026-32201`, is a **Microsoft SharePoint Server spoofing vulnerability** that can let an unauthenticated attacker impersonate a user and read or modify certain data. Microsoft also patched `CVE-2026-33825`, a **publicly disclosed Microsoft Defender elevation-of-privilege flaw** that affects systems only when Defender is enabled; the company said customers using Defender automatic updates are remediated automatically. Among the most severe issues, Microsoft highlighted `CVE-2026-33824`, a **Critical Windows Internet Key Exchange (IKE) Service Extensions remote code execution vulnerability** with a **CVSS 9.8**, and advised defenders to restrict **UDP ports 500 and 4500** until patching is complete. Elevation-of-privilege bugs made up the largest share of the release with **94 CVEs**, while **Windows** accounted for **131** of the patched vulnerabilities. Microsoft said **24 flaws** were more likely to be exploited within 30 days, **18** carried CVSS scores of **8.0 or higher**, and the release also included **80 Edge-related advisories**, most inherited from Chrome.
Jun 29, 2026
Microsoft released fixes for **165 vulnerabilities** across Windows, Office, SharePoint, Defender, SQL Server, Azure, .NET, and other products in one of its largest Patch Tuesday updates on record. The most urgent issue was **CVE-2026-32201**, an **actively exploited** improper input validation flaw in **SharePoint Server** that enables unauthenticated network-based spoofing and was immediately added to **CISA's Known Exploited Vulnerabilities** catalog. Microsoft also patched **CVE-2026-33825**, a publicly known **Microsoft Defender** privilege-escalation bug with proof-of-concept code, and **CVE-2026-33824**, a critical **remote code execution** flaw in **Windows IKE Service Extensions** affecting IPsec/VPN infrastructure. Researchers flagged **CVE-2026-33827** in **Windows TCP/IP** as potentially **wormable** under certain IPv6 and IPSec configurations. Other high-impact fixes include **CVE-2026-33120**, a **SQL Server remote code execution** flaw that paired with a separate privilege escalation bug (**CVE-2026-32176**) could enable full server compromise, and **CVE-2026-32220**, a **UEFI Secure Boot bypass** that could allow untrusted code to load during the boot process. The release also addressed elevation of privilege flaws across Desktop Window Manager, WinSock, TDI Translation Driver, Windows Push Notifications, Function Discovery Service, WSUS, Remote Desktop Licensing, Azure Monitor Agent, and Windows kernel components; security feature bypasses in Windows Hello, PowerShell, BitLocker, and Windows Shell; information disclosure bugs in Windows GDI, Print Spooler, Web Account Manager, UPnP Device Host, and the Windows kernel; and denial-of-service issues in .NET/Visual Studio and Windows RDBSS. Cumulative updates for Windows Server 2022 and 23H2 bundled security hardening for Kerberos, RDP, Secure Boot, and WDS, with Microsoft warning that Secure Boot certificates begin expiring in June 2026.
Jun 29, 2026
Microsoft released fixes for **71 CVEs** across 10 product families, including **17 Critical** and **54 Important** vulnerabilities, with the update heavily concentrated on Windows. The most severe issue was **`CVE-2024-49112`**, a **CVSS 9.8** remote code execution flaw in **LDAP** affecting supported Windows client and server versions back to **Windows Server 2008**, while multiple other patches addressed remote code execution risks in **Remote Desktop Services** and additional Windows components. Microsoft also fixed an **actively exploited zero-day**, **`CVE-2024-49138`**, in the **Windows Common Log File System Driver (CLFS)**, and identified six more vulnerabilities as more likely to be exploited within 30 days. Those higher-risk issues affected **SharePoint, MSMQ, ReFS, and several Windows drivers**, underscoring broad exposure across enterprise environments; Sophos said protections were available for five of the patched vulnerabilities, and noted Microsoft patched **1,015 CVEs** through Patch Tuesday during 2024, the company’s highest annual total since 2020.
Jun 29, 2026