SharePoint Zero-Day Vulnerability: What You Need to Know 

22 Jul, 2025
Beau Freeman

details

Did You Hear? Your Sensitive Data Could Be at Risk Right Now!

 

Microsoft has disclosed a critical set of vulnerabilities impacting on-premises SharePoint Server environments. Read on to find out who’s affected and what steps you need to take to stay protected.   

Who Is at Risk? 

SharePoint Online is not affected, but organizations using on-premises SharePoint are vulnerable until patches are applied. 

Affected versions include: 

  • SharePoint Server Subscription Edition
  • SharePoint Server 2016
  • SharePoint Server 2019

Microsoft has released security updates for these versions. Applying these patches immediately is essential to protect your systems. 

What’s Happening? 

These vulnerabilities allow unauthenticated remote code execution, giving attackers potential access to sensitive systems. Microsoft has confirmed that multiple organizations across industries have already been targeted. 

Immediate actions: 

  • Apply the latest security updates
  • Rotate sensitive credentials
  • Monitor for suspicious activity
  • Enable AMSI integration, Defender Antivirus, and Defender for Endpoint

What Can You Do? 

KMicro is actively supporting clients to secure their SharePoint environments. We've created a Quick Action Guide to help your team respond effectively. 

Quick Action Guide 

Step 1: Identify the Vulnerability
Review Microsoft Security Advisories (MSRC) for the latest information, including official patches and updates. 

Step 2: Assess the Impact
Determine which versions in your environment are affected and note Microsoft's recommended actions. 

Step 3: Confirm Your Exposure
Check your current SharePoint Server version to see if it's vulnerable. 

Step 4: Reduce Exposure
Temporarily restrict external access to SharePoint until all patches are applied. 

  

Ready to Take Action? 

Partner with KMicro 

This is not the time for guesswork. With zero-day exploits actively being used, expert support is essential. KMicro specializes in Microsoft environments and is already assisting organizations like yours with swift, effective remediation. 

We don’t just apply patches. We provide a complete response lead by Rapid implementation of Microsoft’s critical updates.  

Whether your systems have already been impacted or you’re taking proactive measures, KMicro is the trusted partner you need to secure your SharePoint environment and protect your business.