Overview

On June 9, NSFOCUS CERT detected that Microsoft released a security update patch for June, fixing 206 security issues involving widely used products such as Windows, Microsoft Office, Microsoft Exchange Server, Visual Studio Code, Azure, etc., including remote code execution vulnerabilities, High-risk vulnerability types such as information leakage vulnerabilities and privilege escalation vulnerabilities.

Of the vulnerabilities fixed in Microsoft’s monthly update this month, 38 were critical and 168 were important. 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-Jun

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:

Remote Desktop Client remote code execution vulnerability (CVE-2026-47289):

A remote code execution vulnerability exists in the remote desktop client. Since there is a stack buffer overflow when processing response data from a malicious server, an unauthenticated attacker can build a malicious remote desktop server to induce users to initiate connections and process malicious certificates when connecting to trigger the vulnerability, thereby executing arbitrary code with the user permissions of the client. CVSS score 8.8.

Official announcement link: https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-47289

Microsoft Office Remote Code Execution Vulnerability (CVE-2026-45461/CVE-2026-45472/CVE-2026-45474):

A use-after-free vulnerability exists in Microsoft Office, where an unauthenticated attacker can trick users into previewing or opening a specially crafted malicious document that causes arbitrary code execution. CVSS score 8.4.

Official announcement links:

https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-45461

https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-45472

https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-45474

Windows Kernel Remote Code Execution Vulnerability (CVE-2026-45657):

A remote code execution vulnerability exists in the Windows Kernel. Due to post-release use and stack buffer overflow issues when the kernel processes objects, an unauthenticated attacker can trigger a defect in the Windows kernel’s processing of specific TCP/IP data through a specially crafted request, thereby executing arbitrary code with system-level privileges. CVSS score 9.8

Official announcement link: https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-45657

HTTP.sys Remote Code Execution Vulnerability (CVE-2026-47291):

A remote code execution vulnerability exists in HTTP.sys, where an unauthenticated attacker can trigger memory corruption by constructing a specially crafted HTTP packet to execute arbitrary code on the target system due to integer overflow or wraparound issues in the HTTP protocol stack when processing specially crafted requests. CVSS score 9.8.

Official announcement link: https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-47291

DHCP Client Service Remote Code Execution Vulnerability (CVE-2026-44815):

A remote code execution vulnerability exists in the DHCP client service. Due to a stack buffer overflow when the DHCP client processes network data, an unauthenticated attacker can trigger memory corruption through a specially crafted DHCP response packet, thereby executing arbitrary code on the target device. CVSS score 9.8.

Official announcement link: https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-44815

Windows Graphics Component Remote Code Execution Vulnerability (CVE-2026-44803/CVE-2026-44812):

There is a remote code execution vulnerability in the Windows graphics component. Due to the integer overflow or wraparound problem when the graphics component processes specially crafted images or files, an unauthenticated attacker can trigger the vulnerability by tricking users into opening maliciously constructed files or visiting malicious websites. Users previewing panes or opening files will cause arbitrary code execution. CVSS score 7.8.

Official announcement links:

https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-44803

https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-44812

Windows Hyper-V Remote Code Execution Vulnerability (CVE-2026-45607/CVE-2026-45641):

A remote code execution vulnerability exists in Windows Hyper-V. Due to out-of-bounds read and type obfuscation issues in Hyper-V, an authenticated attacker on a VM can execute code on the host server by sending specially crafted file operation requests to the hardware resources of the virtual machine. CVSS score 8.4.

Official announcement links:

https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-45607

https://msrc.microsoft.com/update-guide/zh-cn/vulnerability/CVE-2026-45641

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

Patch update

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-Jun

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

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.

The post Microsoft’s Security Update in June of High-Risk Vulnerability Notice for Multiple Products appeared first on NSFOCUS.

*** This is a Security Bloggers Network syndicated blog from NSFOCUS authored by NSFOCUS. Read the original post at: https://nsfocusglobal.com/microsofts-security-update-in-june-of-high-risk-vulnerability-notice-for-multiple-products-2/