Overview

On April 15, NSFOCUS CERT detected that Microsoft released the April Security Update patch, fixing 165 security issues involving Windows, Microsoft Office, Microsoft SQL Server, Microsoft Visual Studio, Microsoft .NET Framework, Widely used products such as Azure, including high-risk vulnerability types such as privilege escalation and remote code execution.

Among the vulnerabilities fixed by Microsoft’s monthly update this month, there are 8 critical vulnerabilities, 154 important vulnerabilities, 2 moderate vulnerabilities, and 1 low-risk (Low) vulnerability. These include 1 vulnerability that has been detected for wild exploitation:

Microsoft SharePoint Server Spoofing Vulnerability (CVE-2026-32201)

Please update the patch as soon as possible for protection. For a complete list of vulnerabilities, please refer to the appendix.

Reference link: https://msrc.microsoft.com/update-guide/releaseNote/2026-Apr

Key Vulnerabilities

Based on the product popularity and vulnerability importance, this update contains vulnerabilities with greater impact. Relevant users are requested to pay special attention:

Microsoft SharePoint Server Spoofing Vulnerability (CVE-2026-32201):

There is a spoofing vulnerability in Microsoft SharePoint Server. Due to improper input validation of SharePoint Server, unauthenticated attackers can conduct spoofing attacks through the network to view some sensitive information and tamper with publicly available information. The vulnerability is exploited in the wild and has a CVSS score of 9.0.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201

Windows Kerberos Privilege Escalation Vulnerability (CVE-2026-27912):

There is a privilege escalation vulnerability in Windows Kerberos. Due to improper authorization during the verification process of the Kerberos service ticket request, an authenticated attacker can bypass security checks by manipulating the Kerberos ticket field and elevate privileges on adjacent networks, possibly gaining domain administrator privileges. CVSS score 8.0.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27912

Remote Desktop Client remote code execution vulnerability (CVE-2026-32157):

A remote code execution vulnerability exists in the Remote Desktop Client. Due to the Use After Free problem when processing RDP connection parameters, an unauthenticated attacker can execute arbitrary code on the client host by tricking users into connecting to a malicious RDP server. CVSS score 8.8.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32157

Windows TCP/IP Remote Code Execution Vulnerability (CVE-2026-33827):

A remote code execution vulnerability exists in Windows TCP/IP. Due to improper synchronization mechanism when using shared resources in Windows TCP/IP, an unauthenticated attacker can exploit this vulnerability over the network to execute arbitrary code. CVSS score 8.1.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33827

Windows Shell Security Function Bypass Vulnerability (CVE-2026-32225):

There is a security feature bypass vulnerability in Windows Shell. Due to the failure of the protection mechanism in Windows Shell, an unauthenticated attacker can bypass SmartScreen security protection by tricking the victim into opening a specially crafted .lnk file, resulting in unauthorized operation or access. CVSS score 8.8.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32225

Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability (CVE-2026-33824):

A remote code execution vulnerability exists in Windows Internet Key Exchange (IKE) Service Extensions, which allows an unauthenticated attacker to send specially crafted packets to IKEv2 enabled Windows systems due to a Double Free issue in the Windows IKE extension. Thereby enabling remote code execution. CVSS score 9.8.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33824

Microsoft Defender Privilege Escalation Vulnerability (CVE-2026-33825):

There is a privilege escalation vulnerability in Microsoft Defender. Due to insufficient access control granularity in Microsoft Defender, an authenticated local attacker can elevate privileges to SYSTEM. CVSS score 7.8.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825

Windows Active Directory Remote Code Execution Vulnerability (CVE-2026-33826):

A remote code execution vulnerability exists in Windows Active Directory. Due to improper input validation in Windows Active Directory, an authenticated attacker can send a specially crafted RPC call to the RPC host through an adjacent network to achieve remote code execution. CVSS score 8.0.

Official announcement link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826

Scope of Impact

The following are the affected product versions of some key vulnerabilities. For the scope of products affected by other vulnerabilities, please refer to the official announcement link.

Mitigation

At present, Microsoft has officially released security patches to fix the above vulnerabilities for supported product versions. It is strongly recommended that affected users install patches as soon as possible for protection. The official download link: https://msrc.microsoft.com/update-guide/releaseNote/2026-Apr

Note: Patch updates for Windows Update may fail due to network problems, computer environment problems, etc. After installing the patch, users should check whether the patch has been successfully updated in time.

Right-click the Windows icon, select “Settings (N)”, select “Update and Security”-“Windows Update”, view the prompt information on this page, or click “View Update History” to view the historical update status.

For updates that have not been successfully installed, you can click the update name to jump to the Microsoft official download page. It is recommended that users click the link on this page and go to the “Microsoft Update Catalog” website to download the independent program package and install it.

Appendix: Vulnerability List

Statement

This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.

About NSFOCUS

NSFOCUS, a pioneering leader in cybersecurity, is dedicated to safeguarding telecommunications, Internet service providers, hosting providers, and enterprises from sophisticated cyberattacks.

Founded in 2000, NSFOCUS operates globally with over 3000 employees at two headquarters in Beijing, China, and Santa Clara, CA, USA, and over 50 offices worldwide. It has a proven track record of protecting over 25% of the Fortune Global 500 companies, including four of the five largest banks and six of the world’s top ten telecommunications companies.

Leveraging technical prowess and innovation, NSFOCUS delivers a comprehensive suite of security solutions, including the Intelligent Security Operations Platform (ISOP) for modern SOC, DDoS Protection, Continuous Threat Exposure Management (CTEM) Service and Web Application and API Protection (WAAP). All the solutions and services are augmented by the Security Large Language Model (SecLLM), ML, patented algorithms and other cutting-edge research achievements developed by NSFOCUS.

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*** This is a Security Bloggers Network syndicated blog from NSFOCUS authored by NSFOCUS. Read the original post at: https://nsfocusglobal.com/microsofts-april-security-update-of-high-risk-vulnerability-notice-for-multiple-products/