Microsoft’s latest Patch Tuesday isn’t just another monthly security update—it has become the largest security release in the company’s history. With 622 vulnerabilities fixed and two zero-day vulnerabilities already being exploited, organizations that delay patching are exposing themselves to unnecessary risk. KIS Technologies Inc. helps businesses stay protected through proactive patch management, vulnerability monitoring, and managed IT services that reduce the chances of these threats becoming costly incidents.
Many businesses assume that only “Critical” vulnerabilities deserve immediate attention, but this month’s updates prove that assumption can be dangerous. Some of the actively exploited vulnerabilities received lower severity ratings, showing that real-world exploitation matters far more than a number on a scoring chart.
Microsoft’s Largest Patch Tuesday Changes the Conversation
Microsoft’s July update is remarkable not only because of the number of vulnerabilities addressed but because of what those vulnerabilities target. Identity systems, collaboration platforms, operating systems, developer tools, Office products, and enterprise servers all received security fixes.
While fixing hundreds of vulnerabilities sounds overwhelming, businesses should avoid treating every vulnerability equally. Instead, security teams should prioritize patches that are actively being exploited and those affecting systems exposed to the internet.
The Two Zero-Days That Should Be Patched Immediately
The most urgent vulnerabilities affect SharePoint Server and Active Directory Federation Services (AD FS).
The SharePoint vulnerability allows attackers to gain elevated privileges remotely without requiring authentication or user interaction. Since many organizations use SharePoint to store sensitive documents and internal business data, a successful attack could provide criminals with valuable access to confidential information.
The Active Directory Federation Services vulnerability is equally concerning. Although it requires an authenticated attacker, AD FS plays a central role in identity management and authentication. If compromised, attackers may gain elevated access that could impact multiple connected systems.
Severity Scores Don’t Tell the Whole Story
One of the biggest lessons from this month’s release is that organizations should stop relying exclusively on CVSS scores when deciding what to patch first.
Some vulnerabilities with moderate severity ratings are already being actively exploited, while some higher-scoring vulnerabilities have not been observed in real-world attacks. Security teams need to combine Microsoft’s exploitability indicators with threat intelligence, CISA advisories, and internal risk assessments instead of following severity ratings alone.
AI Is Speeding Up Both Defense and Attacks
Microsoft previously announced that artificial intelligence is helping discover software vulnerabilities much faster. That benefits defenders because security flaws are identified before attackers can abuse them.
However, the opposite is also true.
Once Microsoft releases patches, cybercriminals quickly compare the updated files with previous versions to understand exactly what changed. This process helps attackers reverse engineer the vulnerability and create exploits much faster than in previous years. The window between a patch release and active exploitation continues to shrink.
Organizations that previously waited a week or two before applying updates may find that approach increasingly risky.
Legacy Systems Continue to Create Security Challenges
Beyond the zero-days, Microsoft also completed another phase of its long-term effort to remove outdated RC4 encryption from Kerberos authentication.
Older Configurations Could Break After Updating
Businesses still relying on legacy authentication methods may experience login failures after installing the latest updates if they haven’t already migrated to modern encryption standards.
Rather than delaying updates, organizations should identify outdated service accounts, rotate passwords where necessary, and verify compatibility before deploying patches across production environments.
Keeping older technologies in place often creates operational headaches while also increasing long-term security risks.
SharePoint Remains a High-Value Target
SharePoint continues to attract attackers because it frequently stores contracts, financial documents, intellectual property, and other sensitive business information.
This month’s update includes both an actively exploited zero-day and another authentication bypass vulnerability that researchers chained with a separate remote code execution vulnerability. Even though the second half of that attack chain will not be patched until August, installing the available July updates helps eliminate one critical piece attackers rely on.
Organizations running on-premises SharePoint environments should treat these updates as a high priority.
What Businesses Should Learn From This Patch Tuesday
The record-breaking number of vulnerabilities should not create panic, but it should encourage organizations to improve how they manage security updates.
Rather than focusing on the total number of vulnerabilities, businesses should strengthen patch management processes, continuously monitor for exploited vulnerabilities, retire unsupported systems, and regularly review identity infrastructure. Cybersecurity is no longer just about installing updates—it is about knowing which updates matter most and deploying them before attackers can take advantage of them.
As software continues to grow more complex and AI accelerates vulnerability discovery, timely patch management will become one of the most effective defenses available. Organizations that maintain disciplined update practices will be in a far stronger position than those that continue postponing critical security maintenance.