Microsoft’s September 2026 Patch Tuesday fixed close to a thousand vulnerabilities, and one of them deserves attention this week: CVE-2026-69525, a flaw in Remote Desktop Services rated 9.8 out of 10 for severity. An attacker doesn’t need a password or a click from an employee to use it. They just need network access to a vulnerable server. If your Southwest Florida business runs Remote Desktop Services, an RDP gateway, or terminal servers for remote staff, get this patch tested and deployed now rather than waiting for a routine maintenance window.
- CVE-2026-69525 is a 9.8-severity, no-login-required flaw in Remote Desktop Services, and researchers rate exploitation as more likely, not just possible.
- September’s release addressed roughly 950 vulnerabilities across Windows, Exchange, SharePoint, and SQL Server, including two zero-days already seen in attacks, according to BleepingComputer’s coverage of the release.
- SharePoint (CVE-2026-69465) and SQL Server (CVE-2026-65669) also received critical fixes that touch tools many small businesses run internally.
- Verizon’s 2026 Data Breach Investigations Report found small and medium businesses involved in 88% of the breaches it studied, with unpatched systems a recurring entry point, per Verizon’s official DBIR report page.
- Businesses that expose RDP directly to the internet, even behind a VPN, should confirm this patch is applied and consider a zero-trust remote access tool instead of leaving Remote Desktop reachable at all.
What is CVE-2026-69525 and why does it matter for small business?
CVE-2026-69525 is a use-after-free bug in Remote Desktop Services. In plain terms, the software mishandles a piece of memory it already freed, and an attacker who sends the right crafted request over the network can hijack that mishandling to run their own code on the server. No stolen password, no phishing email, no user has to do anything wrong. According to the Zero Day Initiative’s technical review of the September release, the bug requires no privileges and no user interaction, which is why Microsoft flagged exploitation as “more likely” rather than merely theoretical.
For a Southwest Florida business, that server is often the one your bookkeeper or a remote employee logs into from home. Naples and Fort Myers firms leaned harder on remote access after recent storm seasons, and that convenience is exactly what this flaw targets.
What else shipped in September’s Patch Tuesday?
Remote Desktop Services wasn’t the only critical fix. CVE-2026-69465, an authorization flaw in SharePoint carrying a CVSS score of 8.8, could let an attacker who already has some network foothold execute code against a SharePoint server. CVE-2026-65669, rated 9.6, is an injection vulnerability in SQL Server tied to how it processes instructions submitted through SQL Copilot, and it could let an unauthorized user escalate privileges over the network. Beyond those headline bugs, researchers counted more than a dozen unauthenticated, network-reachable remote code execution flaws across core infrastructure services like DNS and DHCP, per the BleepingComputer report cited above.
Is your business exposed through Remote Desktop?
Start by asking a simple question: does anyone connect to your office network or servers using Remote Desktop, whether through a VPN, a gateway appliance, or a port forwarded straight to the internet? If the answer is yes, or if you’re not sure, that’s the first thing to check with whoever manages your network. A quick scan of open ports, or a look at your firewall rules, will tell you whether RDP is reachable from outside your building. If it is reachable without a VPN in front of it, that’s a bigger and older problem than this specific patch, and it should be fixed regardless of this vulnerability.
We covered the mechanics of staying current on patches in our guide to patch management for Southwest Florida businesses, and last month’s release had its own urgent fix, which we broke down in August’s Patch Tuesday recap. The pattern is consistent: Microsoft ships critical, no-login-required flaws almost every month now, and the businesses that get hurt are the ones running a patch cycle measured in months instead of days.
How should Southwest Florida businesses respond this week?
Test and deploy the September cumulative update on any server running Remote Desktop Services, RDP Gateway, or terminal services first. Prioritize internet-facing systems, then move to internal servers. If you can’t patch immediately because of a legacy application dependency or a change-control process, restrict RDP access to a VPN, limit the accounts allowed to connect remotely, and turn on network-level authentication if it isn’t already on. None of that replaces the patch. It buys you a few days while you schedule it properly.
While you’re in there, check SharePoint and SQL Server versions too. A lot of small businesses run an on-premises SQL Server for a line-of-business app and forget it needs patching as much as Windows does.
Frequently asked questions
What is CVE-2026-69525?
It’s a critical vulnerability in Microsoft’s Remote Desktop Services, fixed in the September 2026 Patch Tuesday release. It carries a CVSS score of 9.8 because an attacker with no credentials can run code on a vulnerable server just by reaching it over the network.
Do I need to worry about this if my business doesn’t use Remote Desktop?
If nobody on your team uses RDP, Remote Desktop Gateway, or terminal servers, this specific flaw doesn’t apply directly. The same release also fixed critical issues in SharePoint and SQL Server, so most businesses still have something worth patching this month.
How quickly should we apply September’s updates?
Researchers rate exploitation of the Remote Desktop flaw as more likely, so test and deploy within days rather than waiting for a routine cycle. A common rule of thumb is 72 hours for anything critical that needs no authentication to exploit.
What if we can’t patch right away?
Restrict RDP to a VPN or zero-trust gateway, take it off the open internet if it’s exposed, and limit which accounts can connect remotely until the patch goes in. A managed IT provider can put an interim mitigation in place while a full patch cycle is scheduled.
If you’re not sure whether your servers are exposed or when they were last patched, SWFIT will check for free. Ask about our 15-minute IT and security review at swfit.io/contact and we’ll tell you exactly where you stand before this becomes a problem instead of a patch.
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