Microsoft has rolled out two new cumulative updates for Windows 11 – KB5121003 and KB5120240 – which bring a host of security patches, bug fixes, and new features to the operating system. These mandatory updates are part of the August 2026 Patch Tuesday release, addressing over 400 vulnerabilities discovered in previous months.
The updates will be automatically pushed out to users through Windows Update, but those who prefer to manually download and install can do so from the Microsoft Update Catalog. It’s worth noting that these cumulative updates apply to versions 25H2/24H2 and 23H2 of Windows 11, with no exclusive changes between the two.
One notable aspect of this update cycle is the inclusion of performance-related fixes that may not be immediately apparent to users. While some enhancements, such as improved file sizes in File Explorer’s Details view and middle-click support for opening folders in new tabs, are tangible improvements, others – like Voice Access’s new Voice Isolation feature – require a bit more setup.
Voice Isolation is designed to help the operating system better recognize user voice input by reducing interference from other speakers and background noise. To enable this feature, users can navigate to Voice Access settings > Improve speech recognition and select Voice Isolation. This will prompt a one-time voice setup process to optimize voice recognition performance. Additionally, users can choose from three speed recognition modes: Voice Isolation, Remove background noise only, or No filtering.
Another notable update is the addition of Korean language support for voice access, which enables users to take advantage of voice commands in their native language. The reliability of starting Voice Access has also been improved, making it easier for users to get up and running with this feature.
Other updates include the introduction of new gesture controls for precision touchpads, allowing users to adjust scroll and zoom speeds as well as accelerate scrolling. Additionally, the update improves keyboard navigation within the Start menu and ensures that system dialogs open at an appropriate size on small tablets.
For those using Windows Hello Enhanced Sign-in Security (ESS), this update extends secure sign-in options beyond devices with built-in fingerprint sensors to include desktops and other Windows 11 PCs equipped with peripheral fingerprint sensors. This is a welcome expansion of ESS capabilities, providing users with greater flexibility in securing their devices.
In practical terms, the most immediate takeaway from these updates is that security-conscious users should ensure they’re running the latest cumulative updates on their Windows 11 systems as soon as possible. While some features may take time to become apparent, the bulk of improvements aim to enhance user experience and provide a more seamless interaction with the operating system.
Source: Bleeping Computer — 2026-08-11