# Microsoft 365 security incidents · pwn.watch

> Security incidents tagged Microsoft 365 (vendor, product, platform or attack type).

Page: https://pwn.watch/t/microsoft-365 · generated 2026-10-23T01:56:39.502Z

## Status (as of 2026-10-23)
- Incidents: 3 (1 live, 1 live and not fully patched, 2 patched)
- Days without a Microsoft 365 security incident: 0 (1 still unpatched, so the counter stays at 0)
- Newest incident started: 2026-10-17

## Feeds
- JSON (incidents + changes + posts): https://pwn.watch/t/microsoft-365.json
- RSS (one item per incident, bumped on each update): https://pwn.watch/t/microsoft-365/feed.xml
- This file: https://pwn.watch/t/microsoft-365/llms.txt
- Whole site: https://pwn.watch/llms.txt · all tags: https://pwn.watch/tags.json

## Incidents (newest first by start date)
- [ConnectWise Cloud Backup shut down after M365 app-identity hijack](https://pwn.watch/i/connectwise-cloud-backup-m365-hijack) ([json](https://pwn.watch/i/connectwise-cloud-backup-m365-hijack.json)): critical, live, partial, started 2026-10-17
- [Midnight Blizzard breaches Microsoft corporate email](https://pwn.watch/i/microsoft-midnight-blizzard-corporate-email-breach) ([json](https://pwn.watch/i/microsoft-midnight-blizzard-corporate-email-breach.json)): high, closed, no-fix-needed, started 2024-01-12
- [Storm-0558: stolen Microsoft signing key used to read government email](https://pwn.watch/i/microsoft-storm-0558-forged-tokens-exchange-online-2023) ([json](https://pwn.watch/i/microsoft-storm-0558-forged-tokens-exchange-online-2023.json)): critical, closed, patched, started 2023-05-15