---
id: 3722
title: "Preventing Downloads from Unmanaged Devices in O365"
source_domain: projectblack.io
source_url: "https://projectblack.io/blog/preventing-downloads-from-unmanaged-devices/"
published_at: "2026-02-24 22:19"
tags: ["cloud", "data-exfiltration", "office-365", "defender-for-cloud-apps", "user-agent", "bypass"]
phying_url: "https://phying.com/item/3722"
lang: en
---

# Preventing Downloads from Unmanaged Devices in O365

## Summary

Defender for Cloud Apps' download blocking is bypassable with magic user-agent strings; the post demonstrates the bypass and recommends native download restrictions in Outlook and SharePoint.

## Intelligence Metadata

- **Sources:** projectblack.io
- **Published:** 2026-02-24 22:19
- **Original:** https://projectblack.io/blog/preventing-downloads-from-unmanaged-devices/
- **Phying News:** https://phying.com/item/3722