Microsoft Patches No Zero-Day Flaws This Month
439This month, Microsoft rolled out a big batch of updates—86 patches in total. These patches cover Office, Windows, and SQL Server. The good news is there are no zero-day vulnerabilities this time. That means no urgent “patch now” alerts from the security team. It’s actually a sign that Microsoft’s update process is working well right now.
Interestingly, some patches for Microsoft’s browser platform have been rated at a lower security level—“moderate”—which is a change from the usual critical or important ratings. This suggests the threat level for these browser-related issues is less severe than before. Microsoft also provided more detailed testing recommendations for September, giving users extra time to deploy these patches safely.
To help organizations understand the risks, Microsoft’s Readiness team created an infographic that explains what to consider when updating different platforms. This guidance is useful because it helps IT teams decide how to test and roll out patches without causing disruptions.
Known Issues and Recent Fixes
Microsoft did report a rare issue affecting devices that received hot patches in September 2025, specifically updates KB5065306 and KB5065432. These devices might experience problems with PowerShell Direct connections when both the host and virtual machines aren’t fully up-to-date. Microsoft is looking into this problem.
Last month, some users faced unwanted UAC prompts when repairing MSI installer packages. Luckily, Microsoft fixed this quickly, and testing confirmed that MSI repairs now work as expected. Quick fixes like this help keep systems running smoothly.
Important Security Revisions and Updates
Several security vulnerabilities have been addressed this month, and some updates require extra attention from administrators. For example, CVE-2025-48807 is a remote code execution flaw in Windows Hyper-V, affecting Windows Server 2016, Windows 11, and newer Windows 10 versions. Microsoft released security updates to patch this.
Another issue, CVE-2025-21293, is an elevation of privilege vulnerability in Active Directory Domain Services. To fix it, Microsoft released update KB5065426 for Windows Server 2025 and Windows 11. If organizations use in-memory HotPatch updates, they should install KB5065474 to stay protected.
PowerShell also received updates. Both PowerShell 7.4 and 7.5 are now affected by a privilege escalation vulnerability (CVE-2025-49734). Microsoft shared additional info on GitHub to clarify which versions are impacted.
Additionally, Microsoft made some “information only” updates that clarify how two vulnerabilities from August—CVE-2025-29833 and CVE-2025-29954—are addressed in the latest patch cycle.
Windows Lifecycle and Certificate Updates
Microsoft didn’t announce any enforcement changes this month. However, they will begin expiring Secure Boot certificates used by most Windows devices starting in June 2026. To avoid disruptions, organizations should review Microsoft’s guidance and update their certificates ahead of time.
Every month, Microsoft’s Readiness team analyzes Patch Tuesday updates and offers detailed testing advice. This month, the focus areas include network infrastructure, graphics, and authentication systems. Significant updates to core networking protocols, DirectX graphics, and Bluetooth connectivity mean organizations need to validate these components carefully.
Testing Network Connectivity and Graphics
Microsoft updated core network components, including socket handling and IPv6 functionality. These low-level changes can impact enterprise connectivity, so IT teams should test sending and receiving data over both IPv4 and IPv6 networks. Large file transfers over IPv6 should be tested to ensure stability and performance. Also, organizations should simulate traffic like remote desktop connections and web browsing, and test messaging apps such as Teams or Skype for connection issues.
Graphics and security features received substantial updates too. IT teams need to verify that graphics applications render correctly, with no flickering or slowdown. Testing DirectX functionality is essential, especially on virtual machines with GPU pass-through enabled. Windows Defender Application Guard should also be tested with Office and Edge to confirm it continues to provide security without performance hiccups.
Ensuring Authentication and Bluetooth Functionality
Security updates to authentication components require thorough testing of login processes. This includes verifying NTLM and Kerberos protocols on both domain and standalone machines. Testing programmatic login APIs like LogonUserEx ensures applications still authenticate smoothly after the updates. Secondary login scenarios and CredSSP should also be tested to confirm they work properly.
Bluetooth device management is another focus area. IT teams should pair and unpair multiple Bluetooth devices—such as earbuds or keyboards—simultaneously to check for stability. Connecting both internal and external Bluetooth adapters and testing PIN-based pairing helps verify that device management remains reliable. During these tests, UI responsiveness and error handling should be monitored closely.
Finally, updates to Routing and Remote Access Services (RRAS) demand thorough testing. Configuration tasks using the management console should be validated for both local and remote setups. Testing different network properties and ensuring proper error messages for misconfigurations help prevent future issues.
Microsoft’s updates this month are well-rounded, addressing security vulnerabilities and improving system stability. Proper testing across network, graphics, and authentication components is key to ensuring a smooth rollout and maintaining enterprise security.
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