Article
July 2026 Patch Tuesday: Key Vulnerabilities Overview
Introduction
Microsoft’s July security update addresses 622 vulnerabilities, including several critical issues. Many of these flaws, particularly those allowing remote code execution and affecting platforms like Windows Server and Microsoft Exchange Server, could be exploited by attackers to compromise your business. Importantly, some of these vulnerabilities are potentially exploitable over the internet, making prompt updates essential. In this article, we provide an overview of this month’s patches and highlight the most notable security issues that require immediate attention.
Summary of July 2026 Patch Tuesday
This month’s Patch Tuesday by Microsoft brings significant attention to critical vulnerabilities, specifically those that could lead to remote code execution. Notable CVEs such as those affecting Windows DHCP Server and Remote Desktop Protocol show the seriousness of these threats. The update underscores the urgent need to address potential weaknesses that could be exploited over the internet, reflecting an evolving risk landscape that places a growing emphasis on cybersecurity vigilance. Key sectors like server management and data exchange are especially highlighted for their vulnerabilities, reinforcing the importance of these updates.
Understanding these updates is crucial in protecting enterprise environments. Below, we categorize the vulnerabilities based on their exposure to the internet.
Updates are listed according to their CVSS Score
Exposed to internet 
July 2026 Patch Tuesday
Internal Network
Exposed to the Internet
Remote Desktop Protocol – Remote Code Execution
Remote Desktop Protocol has a critical memory corruption vulnerability that permits unauthenticated network-level attackers to execute arbitrary code. This flaw could result in unauthorized access and significant security risks via RDP.
Windows DHCP Server – Remote Code Execution
This Remote Code Execution vulnerability in Windows DHCP Server is a heap-based buffer overflow that allows an unauthorized attacker to execute code over a network. The exploit does not require authentication, significantly elevating the risk to systems.
Remote Desktop Client – Remote Code Execution
This vulnerability in Remote Desktop Client allows for Remote Code Execution without authentication. It potentially enables attackers to execute arbitrary code as a local user, posing serious security risks to affected systems.
Windows GDI+ – Remote Code Execution
The vulnerability in Windows GDI+ involves Remote Code Execution via crafted input, enabling attackers to execute arbitrary code by targeting graphical data. This presents a significant risk as it can result in unauthorized actions on compromised systems.
Microsoft Exchange Server – Spoofing
Microsoft Exchange Server has a stored cross-site scripting flaw, leading to a Spoofing Vulnerability. An attacker can send a specially crafted email, which when opened in OWA, executes arbitrary JavaScript in the victim’s browser, potentially leading to further exploits.
Windows DHCP Server – Remote Code Execution
A heap-based buffer overflow in the DHCP Server Service of Windows allows attackers to execute code over an adjacent network. This Remote Code Execution vulnerability does not require authentication, posing a serious threat to affected systems.
Microsoft SharePoint Server – Security Feature Bypass
The Security Feature Bypass Vulnerability in Microsoft SharePoint Server is due to weak authentication, potentially allowing unauthenticated remote code execution. Exploiting this flaw could lead to unauthorized script execution on vulnerable servers.
Microsoft SharePoint Server – Elevation of Privilege
Microsoft SharePoint Server suffers from an Elevation of Privilege vulnerability caused by missing authentication for a critical function. An unauthorized attacker can exploit this weakness, enabling privilege elevation over the network, leading to potential security breaches.
Internal Network
Active Directory Federation Services – Elevation of Privilege
Active Directory Federation Services can be exploited to grant administrative privileges due to insufficient access control granularity. This vulnerability allows an authorized attacker to elevate privileges locally, potentially compromising system security.
Windows BitLocker – Security Feature Bypass
A vulnerability in Windows BitLocker can be exploited by an attacker with physical access to a device, allowing them to bypass BitLocker encryption. This Security Feature Bypass could lead to unauthorized access to sensitive encrypted data.
Conclusion
In light of these significant security updates, it is crucial for businesses and individuals alike to implement Microsoft’s patches promptly. Key takeaways from this month’s Patch Tuesday include the pressing need to secure systems vulnerable to internet-based attacks, especially those involving remote code execution. Stay informed and vigilant about the latest cybersecurity threats, and ensure that your computer systems and software are regularly updated to guard against potential exploits. This proactive approach will help maintain the integrity and security of your digital operations.
Have questions about implementing these patches or securing your IT environment? Schedule a call with At-Bay’s Advisory Services team to get started.
About CVSS
The Common Vulnerability Scoring System (CVSS) is an industry-standard framework for evaluating and communicating the severity of software vulnerabilities. It provides a numerical score that helps organizations prioritize and address security issues effectively. CVSS scores quantify the severity of a vulnerability on a scale from 0 (no severity) to 10 (critical severity). CVSS considers multiple factors, including; Exploitability, Impact, Exploit code maturity, Remediation level, Report confidence. The system enables organizations to compare and prioritize vulnerabilities based on their potential impact on IT infrastructure.
References
- https://www.thezdi.com/blog/2026/7/14/the-july-2026-security-update-review
- https://blog.talosintelligence.com/microsoft-patch-tuesday-july-2026/
- https://www.bleepingcomputer.com/news/microsoft/microsoft-july-2026-patch-tuesday-fixes-massive-570-flaws-3-zero-days/
- https://www.rapid7.com/blog/post/em-patch-tuesday-july-2026/
- https://msrc.microsoft.com/update-guide/releasenote/2026-jul
- https://community.spiceworks.com/t/july-2026-patch-tuesday-largest-in-history-so-far/1255617
- https://krebsonsecurity.com/2026/07/microsoft-patches-a-record-570-security-flaws/