September 2026 Patch Tuesday Breakdown: The Adobe Commerce Flaw, Windows Zero-Days, and Firewall Warnings Every Business Owner Needs to Know
September 2026 just delivered the largest Patch Tuesday in Microsoft's history — 966 fixes, 105 of them critical — and it landed the same week Adobe rushed out an emergency patch for a flaw hackers were already using to plant backdoors on real online stores. If you own or manage a business on Florida's Treasure Coast, Space Coast, or in South Florida, here's what you actually need to know, in plain English, without the jargon.
The Biggest Patch Tuesday Microsoft Has Ever Released
Microsoft fixed 966 vulnerabilities this month, with 105 marked critical — the largest release the company has ever put out. That total doesn't even include roughly 204 additional fixes quietly pushed to Azure and Copilot during the month. Adobe fixed more than 170 problems across seven products, and firewall vendors including Fortinet, Cisco, and Progress all rushed out emergency fixes of their own.
You don't need to track all 1,000+ individual fixes. You need to know the four stories below — the ones that could actually cost you money or shut your business down. Sorting through that volume every single month is exactly the kind of workload our managed IT services are built to carry, so nothing slips through the cracks on your end.
1. The Adobe Commerce (Magento) Flaw Hackers Were Already Exploiting
If you sell anything online, this is today's problem, not someday's. Adobe rushed out a fix for Adobe Commerce — known to many as Magento — after hackers were caught exploiting a flaw as early as September 4th.
Here's how it worked: online stores send an automatic email when a customer's payment fails. Hackers figured out how to hide their attack inside that routine email and take complete control of the store without anyone clicking anything. The security firm Sansec found multiple hacking groups using the flaw to plant secret backdoors and steal credit card numbers. Adobe rated the flaw a perfect 10 out of 10 for severity — as bad as it gets.
What to do: if you run a store on Adobe Commerce or Magento, update today, and have someone you trust check whether an attacker was already inside before you patched. Installing the patch closes the door — it does not evict a hacker who already got in. Even if you don't run a store yourself, watch your card statements if you've shopped at a small online retailer recently. Checking for exactly this kind of prior compromise is a core part of our advanced cybersecurity services.
2. Two Windows Zero-Days Already Being Used in Real Attacks
Microsoft patched two vulnerabilities this month that hackers were already exploiting before the fix was released. Both are what security professionals call "complete control" flaws — meaning if an attacker already tricked you with a fake email or bad download and got a small foothold on your computer, these let them turn that foothold into full control of the machine.
The first is in the Windows Update system itself — the very system meant to keep you safe. Hackers could trick it into opening a booby-trapped shortcut that hands over complete control. The second is in how different parts of Windows communicate internally; an attacker could overload it and take over the machine the same way.
What this means for you: these aren't how hackers get in from the outside — they're how hackers take over once they're already in. Your front door is still email and downloads. Don't open attachments you weren't expecting, verify attachments even when you were expecting them, and never click update pop-ups in your browser — only install updates through Settings.
3. Nearly 20 "Wormable" Flaws That Spread Without Anyone Clicking Anything
Researchers flagged about 20 flaws in this release that can spread from one vulnerable computer to another with zero clicks required — an unusually high number for a single month.
If your business runs its own email server on Microsoft Exchange, two mail and file-sharing flaws need priority attention, since they let an outsider run commands on your server directly. If your team uses remote desktop to log in from home, that tool is affected too. And if you run multiple virtual machines on one server, a separate flaw lets malicious code break out of one machine and take over the whole box underneath it.
For home users: run Windows Update, then actually restart your computer — don't just close the lid.
For businesses: ask whoever manages your systems this exact question: "Are our Exchange, SharePoint, and remote desktop patches for September installed and rebooted?" Don't accept "we downloaded them" as an answer. If you'd rather not be the one asking that question every month, our IT support for small businesses is built to handle that follow-through for you.
4. Firewall Warnings from Fortinet, Cisco, and Progress
If your office has a firewall box on the wall, this is the section you cannot skip. Think of your firewall as the locked front door to your entire network.
Fortinet confirmed hackers are already using two separate methods to bypass login and gain super-admin control of FortiGate firewalls and VPN devices — complete control of your front door. Cisco fixed a near-maximum-severity flaw in its Catalyst controller and confirmed hackers were separately exploiting another flaw to knock secure firewalls offline; it was serious enough that the federal government ordered agencies to patch by mid-August. Progress LoadMaster, used by many businesses to balance web traffic, has a flaw that lets an attacker run commands without logging in at all — and the attack instructions are already public.
What to do: don't log into these devices yourself. Contact whoever manages your firewall and email server and ask directly: "Are the Fortinet, Cisco, and LoadMaster patches installed and confirmed for September?" Get it in writing.
Your Three-Step Checklist for This Week
1. Update and restart. On every Windows computer: Settings → Windows Update → install available updates → restart (not just close the lid). Do the same for Adobe Reader, Photoshop, and your browser. If you run a store on Adobe Commerce or Magento, update today and check for prior break-ins.
2. Confirm your front door. Get written confirmation from whoever manages your firewall and email server that September's patches are installed — not just downloaded.
3. Tighten the human front door. Remind your team not to open unexpected attachments or approve login prompts they didn't trigger, and turn on automatic updates wherever possible.
How A Faster PC Helps Florida Businesses Stay Protected
Keeping up with a thousand security fixes every month isn't a reasonable expectation for any business owner — and it's exactly what A Faster PC handles for clients across Florida's Treasure Coast, Space Coast, and South Florida, along with customers nationwide and internationally. We manage patching, firewall updates, and cybersecurity monitoring so you can focus on running your business instead of tracking CVEs.
If you'd rather have a team confirm every patch, firewall update, and security fix is actually installed instead of just downloaded, [contact us] at A Faster PC to schedule a free discovery call, or call 772-878-5978 directly. While you're on the site, download our free cybersecurity report to see where small businesses get hit first. We serve businesses throughout the Treasure Coast, Space Coast, and South Florida, and we'd be glad to help wherever you're located.
Questions and Answers
Q: What was Adobe's critical security flaw in September 2026, and does it affect my business?
A: Adobe issued an emergency fix for Adobe Commerce (also known as Magento) after hackers were caught exploiting a flaw that let them hide attacks inside routine "payment failed" emails. Adobe rated it a perfect 10 out of 10 for severity. If you run an online store on Adobe Commerce or Magento, you need to update immediately and have someone check whether an attacker got in before the patch was applied.
Q: Why was September 2026's Patch Tuesday the biggest ever from Microsoft?
A: Microsoft fixed 966 vulnerabilities this month, with 105 rated critical, making it the largest Patch Tuesday release in the company's history. That total doesn't even include roughly 204 additional fixes pushed quietly to Azure and Copilot during the month. Two of the flaws in this release were already being used by hackers before the patch was released.
Q: What are the two Windows zero-day vulnerabilities hackers were already exploiting?
A: One flaw is in the Windows Update system itself, where hackers could trick it into opening a booby-trapped shortcut that hands over complete control of the machine. The second is in how different parts of Windows communicate internally, letting an attacker overload it and take over the computer the same way. Both were confirmed as actively exploited before Microsoft released the fix.
Q: My business runs Microsoft Exchange, SharePoint, or remote desktop tools — should I be worried?
A: Yes. Researchers flagged about 20 vulnerabilities in this release that can spread from one computer to another with no clicks required, an unusually high number for a single month. Exchange, SharePoint, and remote desktop tools were all named among the affected products, so this week is the week to confirm those patches are installed and your systems have been rebooted.
Q: What should I do if my firewall is made by Fortinet, Cisco, or another major vendor?
A: Fortinet confirmed hackers are already using two ways to bypass login and gain super admin control of FortiGate firewalls and VPN boxes. Cisco and Progress also disclosed serious flaws in their networking and firewall products this month, some already being actively exploited. Don't log into these devices yourself — contact whoever manages your firewall and get written confirmation that September's patches are installed and confirmed, not just downloaded.
Q: I'm a home computer user, not a business — do any of these patches affect me?
A: Yes, particularly the Windows Update vulnerabilities and the worm-like flaws Microsoft patched this month. The good news is your fix is simple: open Settings, go to Windows Update, install what's available, and actually restart your computer rather than just closing the lid. You should also update Adobe Reader, Photoshop, and your browser if you use them.
Q: How does A Faster PC help businesses on the Treasure Coast, Space Coast, and South Florida stay protected during major patch releases like this one?
A: A Faster PC is a managed services provider that handles patching, firewall updates, and cybersecurity monitoring for businesses across Florida's Treasure Coast, Space Coast, and South Florida, plus clients nationwide. Instead of tracking hundreds of individual vulnerabilities yourself, our team confirms patches are installed and verified so you can focus on running your business.
Q: If I already installed this month's patches, am I safe?
A: Installing the patch closes the door going forward, but it does not remove an attacker who already got inside before you patched — especially for the Adobe Commerce/Magento flaw. If you run an online store, have someone check your logs for signs of prior compromise. For everyone else, watching your card statements for unusual activity this month is a smart extra step.
Watch the full video here: Don't Get Hacked: The Critical Windows Update You Can't Ignore!
About A Faster PC
A Faster PC the leading managed services provider (MSP) serving Florida's Treasure Coast, Space Coast, and South Florida. A Faster PC provides responsive IT support, advanced cybersecurity solutions, cloud backup, disaster recovery, breach remediation, 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. We help our clients cut costs in their Internet, TV, and telephone bills and in business operations.
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