Windows 10 KB5099539 July 2026 Patch Tuesday Update Out Now

Windows 10 users are getting KB5099539 as July 2026 Patch Tuesday update, alongside KB5101650 & KB5099414, which is also out for Windows 11 users on version 25H2/24H2, and 23H2, respectively.

Windows 10 July 2026 ESU KB5099539 released with bunch of fixes and improvements

As far as Windows 10 KB5099539 ESU is concerned, here’s everything Microsoft included in the changelog:

• [OLE Automation (known issue)] Fixed: Addresses a compatibility issue in OLE Automation (oleaut32.dll) that was introduced by the June 2026 security update. Some applications that use the IDispatch::Invoke method to call COM methods with BYREF parameters that share the same underlying storage might fail. These failures can include parameter marshaling errors or automation call failures. This update corrects how parameter ownership is managed and restores expected application behavior.
• [File Explorer (known issue)] Fixed: An issue where the OneDrive shortcut in File Explorer stops working when File Explorer is run with administrative mode.
• [Recycle Bin (known issue)] Fixed: This update addresses an issue where the confirmation dialog might display an internal Recycle Bin file name instead of the original file name when permanently deleting a file.
• [Input] This update changes hotkey unregister and cleanup behavior. In rare cases, some built-in Windows experiences that rely on previous hotkey lifecycle behavior might temporarily stop responding to certain keyboard shortcuts. This issue can typically be resolved by restarting the app affected. If the issue is not resolved, report it through the Feedback Hub.
• [Secure Boot]
  • This update enables dynamic status reporting for Secure Boot states in Windows Security App.
  • This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
• [Networking] This update introduces a security hardening change that enforces TDI transport registration requirements. As a result, applications that use sockets over unregistered third-party TDI transports might stop working after installing this update. Registered TDI transports are not affected.
• [Remote Desktop (RDP) Security] Support for SHA-2 certificate thumbprints has been added for trusted RDP publishers, with SHA-1 support retained only for backward compatibility and planned for future removal. New guidance is available for managing RDP file security through Group Policy to help organizations reduce phishing risks by controlling which .rdp files users can open. We recommend IT administrators migrate to SHA-256 thumbprints or a stronger algorithm as soon as possible to avoid disruption.

Worth noting that Microsoft hasn’t listed any known issues in this update, so you’re good to go ahead and install it. As a reminder, users on Windows 10 22H2 will see their system build number bump to 19045.7548, while those on version 21H2 will find their system build number changed to 19044.7548 after installing the KB5099539 July 2026 Patch Tuesday update.