KB5087545: improves the accuracy and reliability of calculations used by apps
Windows Server 2022Microsoft
May 12, 2026—KB5087545 (OS Build 20348.5139)
Improvements
This security update contains fixes and quality improvements from KB5082142 (released April 14, 2026) and KB5091575 (released April 19, 2026). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.
- [Secure Boot] With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
- [App] This update improves the accuracy and reliability of calculations used by apps and system components. Users and developers should see more consistent results, especially when working with very small values.
- [Daylight saving time (DST)] This update supports the 2023 DST change for the Arab Republic of Egypt.
- [Desktop] This update improves how the Windows Server interface responds during everyday use. Users should notice smoother interactions and fewer instances where windows stop responding.
- [Sign-In] After you install the Windows update released on or after March 10, 2026, some users might experience an issue signing in to apps with a Microsoft account. Even when the device has a working Internet connection, a “no Internet” error appears during sign in and prevents access to Microsoft services and apps such as Microsoft Teams.
- [Remote Desktop (known issue)] Fixed: This update addresses an issue that affects the Remote Desktop Connection security warning dialog. The dialog could render incorrectly in multi-monitor scenario when the monitors had different scaling set. This might occur after installing the April 2026 (KB5082142) security update. For more information, see Understanding security warnings when opening Remote Desktop (RDP) files.
If you've already installed previous updates, your device will download and install only the new updates included in this package.
