Microsoft released cumulative update KB5122880 for Windows 11 version 23H2 (2023 Update) as part of Patch Tuesday for September 2026. Build 22631.7582 includes security improvements, bug fixes, and system component updates aimed at improving stability and compatibility. The main focus is on Secure Boot operation, time zone adjustments, mobile connectivity profiles, improved OMA DM diagnostics, and a fix for audio in Remote Desktop.
- Secure Boot. Microsoft has expanded the list of devices that can automatically receive new Secure Boot certificates. Their distribution through Windows Update will continue in the coming months on supported consumer and unmanaged corporate PCs.
- Date and time. Morocco time zone settings have been updated due to the country's transition to permanent UTC+00:00 time starting September 20, 2026.
- Mobile connectivity. COSA profiles for Telavox and Swisscom operators have been updated.
- OMA DM. Logging for the Omadmclient component has been improved. More debug information is now saved when connecting to the server.
- Remote Desktop. Fixed an audio redirection issue that could prevent audio from a remote session from playing on the local computer in some configurations.
To install the update, open Settings, go to Windows Update, and click Check for updates. Cumulative update KB5122880 for PCs is installed automatically through Windows Update for Enterprise and Education editions.
| Feature / Change | Performance Impact (Increase/Decrease) | Optimization | PC Speed Impact | Gaming Optimization |
|---|---|---|---|---|
| Secure Boot certificate distribution via Windows Update | ⚪ No measurable impact (0%) | 🟢 High — automated certificate delivery reduces manual maintenance and downtime | ⚪ No direct impact (boot time unchanged in practice) | ⚪ No impact — security-only change |
| Morocco time zone update (permanent UTC+00:00) | ⚪ No impact (0%) | 🟡 Low — eliminates recurring DST adjustment overhead | ⚪ No measurable impact | ⚪ No impact |
| COSA profile updates for Telavox and Swisscom | ⚪ No impact (0%) | 🟡 Medium — improved mobile connectivity reliability reduces network-related stalls | 🔴 Negligible improvement in network-dependent tasks (0–1%) | 🟡 Very low — smoother connectivity may slightly reduce latency spikes in online gaming on cellular |
| OMA DM — improved Omadmclient logging | 🔴 Minor decrease (0–0.5%) — additional logging overhead during sync | 🟡 Medium — better diagnostics can speed up troubleshooting and policy delivery | 🔴 Negligible slowdown during device management sessions only | ⚪ No impact |
| Remote Desktop audio redirection fix | 🟢 Minor improvement (avoids audio failure overhead) | 🟢 High — fixes broken scenario, reduces retries and workarounds | 🟢 Very small improvement in remote session responsiveness (1–2% in affected configs) | 🟡 Low — removes audio-related stalls in remote gaming/streaming setups |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5126657 | 19045.7807 | 22H2 (ESU) | Windows 10 | Stable | 2026-10-13 |
| KB5126653 | 22631.7652 | 23H2 | Windows 11 | Stable | 2026-10-13 |
| KB5127646 | 28000.3231 | 26H1 | Windows 11 | Stable | 2026-10-13 |
| KB5127648 | 26300.9711 | 26H2 | Windows 11 | Stable | 2026-10-13 |
| KB5127757 | 28120.3181 | 26H1 | Windows 11 | Experimental | 2026-10-07 |
| KB5127758 | 26220.9606 | 25H2 | Windows 11 | Beta | 2026-10-07 |
| KB5127754 | 28020.3172 | 26H1 | Windows 11 | Beta | 2026-10-07 |
| KB5127753 | 26340.9616 | 26H2 | Windows 11 | Experimental | 2026-10-07 |
| KB5124192 | 28120.3151 | 26H1 | Windows 11 | Experimental | 2026-10-02 |
| KB5124196 | 28020.3142 | 26H1 | Windows 11 | Beta | 2026-10-02 |