What if I told you there are 138 unlocked doors on your computer right now — and one of them lets hackers walk in without you clicking anything, opening anything, or doing anything wrong at all?
That is not speculation. That is this month's Patch Tuesday.
Microsoft just released fixes for 138 security vulnerabilities, 30 of them rated critical. Buried in that list are bugs that should keep every business owner and every PC user up at night. Whether you're running a business on Florida's Treasure Coast, the Space Coast, or in South Florida — or you work from home or manage a team — here is exactly what's broken, what's at risk, and what to do about it. No jargon. No fluff.
What Is Patch Tuesday?
If you're not familiar, every second Tuesday of the month, Microsoft and other major tech companies release security updates. Think of a patch like a repair kit for a crack in your foundation. Hackers find those cracks and try to squeeze through them. The patches seal them before the bad guys get in.
This month's Patch Tuesday is one for the record books. 138 fixes from Microsoft alone — researchers are calling it nearly the second largest single monthly release in Microsoft's history. Last month was also massive. Two record-breaking months back to back. This is not the month to hit the snooze button.
The 5 Most Dangerous Vulnerabilities This Month
Bug 1: Windows DNS Client — CVE-2026-41096 (Critical)
Let's start with something that touches virtually every Windows PC on the planet. The Windows DNS client is the system that translates website names like google.com into the actual IP addresses your computer uses to find them. It runs on practically every Windows machine — which means practically every Windows machine is exposed.
Here's the danger: an attacker who can i
ntercept your internet traffic — say your employees are on shared Wi-Fi at a coffee shop, or your office router has been compromised — can trigger this bug and take complete control of a computer without the user doing anything. No email to click. No link to open. No warning at all.
If your employees ever work from coffee shops, hotels, or shared workspaces, this is a direct threat to your business.
Bug 2: Microsoft Word — Open and Own (4 Critical Patches)
This one hits every business user right where they live. Microsoft patched four separate critical vulnerabilities in Microsoft Word this month. Simply opening a malicious Word document could allow an attacker to run code on your system — a classic "open and own" scenario.
Criminals weaponize this through phishing emails: a fake invoice, a fake resume, a fake shipping notice. One wrong attachment and your machine is compromised. Excel and SharePoint also received multiple critical patches. If your business runs on Office — and most do — these updates are not optional.
Bug 3: Microsoft Copilot — Your AI Assistant Could Leak Your Data
Microsoft 365 Copilot, Copilot Chat in Edge, and GitHub Copilot all received security patches this month for information disclosure vulnerabilities. These bugs could potentially expose sensitive data flowing through these AI assistants.
If your team is using any of Microsoft's AI tools for business tasks — processing customer data, writing proposals, handling financials — these patches matter. The last thing you want is your AI assistant accidentally leaking information to the wrong people.
Bug 4: Microsoft Dynamics 365 — 9.9 Out of 10 Severity
If your business runs Microsoft Dynamics 365 for CRM or any other operations, pay very close attention to this one. This month's Dynamics 365 bug is rated 9.9 out of 10 on the severity scale. That is about as bad as it gets.
It allows an authenticated user — even a low-level employee account — to execute code and potentially break out and infect other connected systems. If you're running Dynamics 365 on premises, a single compromised employee password could become a full system breach. This one needs immediate attention.
Bug 5: Windows Netlogon — CVE-2026-41089 — The Wormable One
Here is the one I saved for last, and for good reason.
CVE-2026-41089 is a critical flaw in Windows Netlogon. In plain English: an attacker anywhere on the internet can send a specially crafted message to a Windows server, no password required, no trick needed, and take complete control of it. Security researchers describe this as wormable — meaning it has the potential to spread automatically from machine to machine across a network on its own. No action from your employees required.
This is the same type of threat as the WannaCry ransomware attack in 2017 that crippled hospitals, banks, and transportation systems worldwide. TCP/IP — the backbone of every internet connection — runs on every Windows machine. A wormable bug in the backbone of Windows networking is a skeleton key to your entire digital life.
If you have a server at your office — even one — this is not an "I'll get to it this weekend" situation. This needs to be patched today.
Beyond Microsoft: AMD Processor Vulnerability CVE-2025-54518
This month's threats go deeper than software. AMD disclosed a hardware-level vulnerability affecting older Zen 2 processors — specifically:
- AMD Ryzen 3000 series desktop chips
- Ryzen 4000 series desktop chips
- Some EPYC server processors
- Built roughly between 2019 and 2021
Your processor has something called an op cache — a small, ultra-fast memory area that stores recently used instructions to speed things up. Due to this vulnerability, resources in that cache can be improperly shared, potentially causing malicious code to run at a higher privilege level than it should. Think of it like someone sneaking into the express lane at the airport — they get through security faster than they should.
AMD has released a microcode update — essentially a firmware patch for the CPU itself — and Microsoft is distributing it through Windows updates as part of this Patch Tuesday. If you have an AMD-based computer built between 2019 and 2021, make sure your Windows updates are current and check your PC manufacturer's website for any BIOS updates.
Other Vendors Patching This Month
This month is not just a Microsoft problem. It is an everything problem.
- Adobe released security updates for Acrobat, Reader, Commerce, and Experience Manager. If anyone in your office opens PDFs — and who doesn't — these patches are a must.
- Apple pushed updates for macOS, iOS, and iPadOS. If your business runs on Macs, iPhones, or iPads, get these installed.
- Cisco patched vulnerabilities in Meraki and web security appliances. Your IT provider needs to handle these.
- Fortinet fixed multiple critical bugs in FortiGate firewalls and FortiManager. A critical bug in your firewall is like finding a hole in the vault door — fix it immediately.
- SAP released its monthly security updates for enterprise products.
- Google Android pushed its May 2026 security bulletin with fixes for Google and Qualcomm components. If your team uses Android devices for business, update them now.
- Ivanti patched critical vulnerabilities in Connect Secure and Policy Secure gateways — the remote access tools that let employees work from home. A bug here is an open invitation for attackers to walk right into your network.
Every vendor. Every platform. Every device. They all need attention this month.
Your 5-Step Action Plan
- Step one: Run Windows updates on every computer in your office and every computer you work from — today. Not tomorrow. Not next week. Today.
- Step two: If you have an AMD processor built between 2019 and 2021, make sure the microcode update came through Windows updates and check your manufacturer's website for a BIOS update.
- Step three: Update Adobe Acrobat and Reader on every machine. Update your Macs, iPhones, and Android phones. If your office uses Cisco, Fortinet, or Ivanti, make sure your IT provider has those covered.
- Step four: If you're running Microsoft Dynamics 365 on premises, prioritize that 9.9 severity bug above everything else.
- Step five: Turn on automatic updates if you haven't already. The single biggest mistake small businesses make is leaving updates set to manual. Every month there is a new batch of fixes. If you're not applying them automatically, you're always behind.
Let A Faster PC Handle This for You
Look, I know that's a lot. Patch Tuesday comes every month, and every month the list gets longer. If you're a business owner on Florida's Treasure Coast, Space Coast, or South Florida, and you're thinking, "I don't have time to manage all of this — I'm trying to run my business," that's exactly where A Faster PC can help.
A Faster PC is a managed services provider serving businesses across the Treasure Coast, Space Coast, and South Florida. We handle patch management, security monitoring, and IT support for businesses just like yours. We make sure every update gets applied, every vulnerability gets patched, and every device on your network stays protected — so you can focus on running your business instead of worrying about it.
If you need help, even just a question about whether your systems are current, call us at 772-878-5978 or visit AFasterPC.com. While you're there, download our free report, The Small Business Cyber Security Crisis. It breaks down the biggest threats facing small businesses right now and what you can do about it. Completely free. No strings attached.
When you have — or want to prevent — cybersecurity problems, you need A Faster PC.
Watch our Video: Your Computer Has 138 New Security Holes—Here's Why.
A Faster PC is a leading managed services provider (MSP) serving Florida's Treasure Coast, Space Coast, and South Florida. We provide comprehensive IT support, advanced cybersecurity solutions, patch management, computer repair, and technical support for accounting offices, attorneys' offices, medical offices, dental offices, professional offices, small- to medium-sized businesses, non-profits, churches, home office users, and individuals throughout the regions.
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