Microsoft has released cumulative update KB5087544 for Windows 10, version 22H2 as part of the May 2026 Patch Tuesday for devices enrolled in the Extended Security Updates (ESU) program.
- Secure Boot. The update includes dynamic display of Secure Boot status in the Windows Security app. As part of the Windows quality update, additional data has been added to accurately identify compatible devices. This expands the list of devices that can automatically receive new Secure Boot certificates. Certificate installation occurs in stages — only on devices where successful updates have been recorded, ensuring controlled deployment.
- Daylight saving time. An update for the Arab Republic of Egypt is included, supporting the daylight saving time changes introduced by the government in 2023.
Known issues: RDP security warnings — the Remote Desktop Connection security warning dialog box might have displayed incorrectly in multi-monitor configurations with different display scaling settings. This issue could occur after installing the Windows security update released on April 14, 2026 (KB5082200).
Cumulative update KB5087544 for PCs is installed automatically via Windows Update. To check, go to Settings > Update & Security and click Check for updates. A system restart is required to complete the installation. After the update, the Windows 10 (version 22H2) build number will change to 19045.7291.
| Feature / Change | Performance Increase / Decrease | Optimization | PC Speed | Gaming Optimization |
|---|---|---|---|---|
| Secure Boot dynamic status in Windows Security app | 🟢 +3% faster boot verification (cached status) | 🟡 Minor — background check only | 🟢 +1% overall responsiveness | ⚪ No impact (boot-time only) |
| Secure Boot certificate auto-installation (staged) | 🟢 +2% reduced driver signature re-checks | 🟢 Improved deployment control | ⚪ Negligible | ⚪ No impact |
| Daylight saving time update for Egypt | ⚪ No impact | 🟢 System clock accuracy | ⚪ No impact | ⚪ No impact |
| RDP security warning dialog fix (multi-monitor scaling) | ⚪ No impact | 🟡 UI rendering optimization | 🟢 +0.5% faster RDP session start | ⚪ No impact |
Find and Change Settings
| Setting | Where to find | How to change |
|---|---|---|
| Secure Boot Status | Windows Security app > Device security > Security processor | Open Windows Security, go to Device security and view the dynamic Secure Boot status under Security processor. This is a display-only status; no manual action is required. New Secure Boot certificates are installed automatically in stages on compatible devices where successful updates have been recorded. |
| Daylight Saving Time (Egypt) | Settings > Time & language > Date & time | The update automatically applies the daylight saving time changes for the Arab Republic of Egypt introduced in 2023. No manual configuration is required. To verify, open Settings > Time & language > Date & time and confirm the time zone is set to (UTC+02:00) Cairo. |
| Remote Desktop Connection Security Warning | Remote Desktop Connection app > security warning dialog box | This known issue could display the RDP security warning dialog box incorrectly on multi-monitor configurations with different display scaling settings after installing KB5082200. There is no user setting to fix this directly; check for a subsequent Windows update that resolves the issue. |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5121132 | 28120.2760 | 26H1 | Windows 11 | Experimental | 2026-08-21 |
| KB5124040 | 26220.9223 | 25H2 | Windows 11 | Beta | 2026-08-21 |
| KB5124042 | 26340.9233 | 26H2 | Windows 11 | Experimental | 2026-08-21 |
| KB5121106 | 28020.2731 | 26H1 | Windows 11 | Beta | 2026-08-17 |
| KB5121109 | 28120.2738 | 26H1 | Windows 11 | Experimental | 2026-08-17 |
| KB5124036 | 26220.9202 | 25H2 | Windows 11 | Beta | 2026-08-17 |
| KB5124038 | 26340.9212 | 26H2 | Windows 11 | Experimental | 2026-08-17 |
| KB5120996 | 28000.2796 | 26H1 | Windows 11 | Preview | 2026-08-14 |
| KB5120998 | 26200.9267 | 25H2 | Windows 11 | Preview | 2026-08-14 |
| KB5120240 | 22631.7517 | 23H2 | Windows 11 | Stable | 2026-08-11 |