# Microsoft admits Windows 11's biggest September update is breaking multiple features, days after it warned users not to delay updates

> **Newsylist Open Intelligence Dossier** · First detected: 2026-09-12 15:29 UTC · Category: Technology · Sources: 1 · Current Velocity: 0.25

## Key People, Organizations & Locations
Microsoft, Windows, September

## Multi-Source Evidence Table
| Source Outlet | Headline | Published (UTC) | Verification URL |
|---|---|---|---|
| Pasquale Pillitteri | Windows update KB5124008 breaks boot, VPN and backups, no fix yet | 2026-09-12 01:40 | [Source Link](https://news.google.com/rss/articles/CBMigAFBVV95cUxQZ1JZSDFzWTlCRHE5SmVlWk5MYm92am45SGZDTnQ2bGFDRllRbl9peWV0Tk1xTTgwckJ6U3R0bzVEQUhSaGlwc1NzV0VxNGhndzFtYzVrZUY1aWxhbkw3NVNEeXNOSHZsRXZRVWF6NlpsSFFYczU2dUVIYVUycmtWSA?oc=5) |

---
*Canonical Source: https://www.newsylist.com/trend/2026-09-12/microsoft-admits-windows-11-s-biggest-september-update-is-breaking-multiple*
*Synthesized by Newsylist Open Intelligence Engine under E-E-A-T journalistic standards.*