If your business runs Windows, Microsoft Office, or SQL Server — and most do — you need to pay attention to what happened today. On March 10, 2026, Microsoft released its monthly “Patch Tuesday” security update, fixing 79 vulnerabilities across its products. Two of those flaws were already publicly known before the patches arrived, meaning attackers had a head start.
While that might sound like just another day in the tech world, some of these vulnerabilities could let hackers take over your systems, steal sensitive data, or knock your business offline. Here is what you need to know — in plain English.
What Was Fixed This Month
Microsoft patched vulnerabilities across Windows, Office, SQL Server, Azure, .NET, and more. Among the 79 flaws, eight were rated critical — the highest severity level — and two were publicly disclosed zero-day vulnerabilities that attackers could have already been studying.
Here are the ones that matter most for businesses:
- Microsoft Office Remote Code Execution (CVE-2026-26113, CVE-2026-26110): These flaws allow an attacker to run malicious code on your computer simply by having you preview a specially crafted email or document in Outlook. You do not even have to open the file — just viewing it in the Preview Pane is enough.
- SQL Server Privilege Escalation (CVE-2026-21262): An attacker who already has basic access to your SQL Server can escalate their privileges to full administrator (sysadmin) level. This is especially dangerous for businesses that store customer data, financial records, or other sensitive information in SQL databases.
- Excel Information Disclosure (CVE-2026-26144): This critical flaw in Excel could allow attackers to read sensitive data from your computer’s memory. According to BleepingComputer, it could even be exploited through Microsoft Copilot to exfiltrate data — a concerning new attack vector as businesses adopt AI tools.
- .NET Denial of Service (CVE-2026-26127): Attackers can crash applications built on the .NET framework without needing any credentials, potentially knocking internal tools and services offline.
According to Tenable, 55% of this month’s vulnerabilities are privilege escalation bugs, with six rated as “exploitation more likely” — meaning attackers are expected to develop working exploits soon if they have not already.
Why This Matters for Your Business
You might be thinking: “We are a small business. Hackers go after the big companies, right?” Unfortunately, that is a dangerous myth. According to recent data, 88% of ransomware attacks in 2025 targeted small businesses. Attackers know that smaller companies often lack dedicated IT security teams, making them easier targets.
These vulnerabilities are particularly concerning because many of them require minimal effort to exploit. The Office flaws, for example, only need someone on your team to preview a malicious email — something that happens dozens of times a day in any busy office. And with AI tools like Copilot now integrated into Microsoft 365, new attack surfaces are opening up that many businesses are not even aware of.
If your systems are not patched promptly, you are essentially leaving your front door unlocked. Attackers scan for unpatched systems constantly, and they move fast. The window between a patch being released and exploits appearing in the wild is shrinking — sometimes to just days.
What You Can Do Right Now
Here are immediate steps every business should take:
- Apply the March 2026 updates as soon as possible. Do not wait for “a convenient time.” Schedule updates this week for all Windows workstations, servers, and Office installations.
- Prioritize critical systems. If you run SQL Server for your business applications, the privilege escalation fix (CVE-2026-21262) should be at the top of your list.
- Warn your team about suspicious emails. With the Outlook Preview Pane vulnerabilities, remind employees not to open unexpected attachments or emails from unknown senders.
- Check your .NET applications. If you use custom business applications built on .NET, ensure they are updated to avoid denial-of-service crashes.
- Review your AI tool configurations. If your organization uses Microsoft Copilot, review its permissions and data access settings in light of the Excel/Copilot data exfiltration risk.
How HiveTech Managed Services Can Help
If reading this list makes you feel overwhelmed, you are not alone. Most business owners did not get into their industry to manage software patches and track vulnerability reports. That is exactly where a managed IT services partner makes the difference.
At HiveTech Managed Services, we handle patch management proactively for our clients. When Microsoft releases updates like today’s Patch Tuesday, our team evaluates every fix, tests it for compatibility with your systems, and deploys it — often before you even hear about it in the news. No disruption to your workday, no risk of missed patches.
Beyond patching, we provide 24/7 endpoint monitoring to catch threats in real time, email security filtering to block malicious attachments before they reach your inbox, and security awareness training to help your team recognize phishing attempts. We also manage backup and disaster recovery solutions so that even in a worst-case scenario, your business can recover quickly.
Ready to stop worrying about the next security update? Contact HiveTech Managed Services today for a free security assessment. We will review your current setup, identify gaps, and show you exactly how we can keep your business protected. Reach us at [email protected] or visit hive-tech.co.