Microsoft 365 Copilot Security: What Every User Needs to Know

🚨 The Hidden Risk: “Copy Link” in SharePoint and OneDrive

If you’ve ever clicked “Copy link” in SharePoint or OneDrive to share a file, you might assume you’re only sharing it with the person you send it to. But depending on your organisation’s default sharing policy, you could be giving edit access to everyone in the company without even knowing it.

Here’s the issue: if the default setting is “People in your organisation”, then every time you click “Copy link,” you’re potentially exposing that file to hundreds or thousands of colleagues. And that means that Copilot could use that data to answer prompts like “Show me the salary report” or “Summarise HR documents”.

🧠 How Copilot Handles Your Data

Copilot works within your Microsoft 365 environment. It doesn’t send your data to the public internet or store it externally. Instead, it uses your existing permissions to determine what content it can access.

That’s why users often ask:

• “Does Copilot share my data?”
• “How secure is Copilot in Teams?”
• “How do I check Microsoft 365 Copilot privacy settings”
• “What are the security risks in Microsoft Copilot for Businesses”
• “Is Copilot secure for business use?”

If a file is shared with you, even unintentionally, Copilot can use it to generate responses. It also respects Microsoft Purview sensitivity labels, so files marked as confidential or restricted will carry those protections even if moved or shared.

✅ What You Can Do as an End User

You can’t change the default SharePoint sharing policy only your IT team can do that. But you can check what it is to ensure that Copilot doesn’t access your sensitive files:

1. Select a file in SharePoint or OneDrive.
2. Click Share.
3. In the dialogue box, click the Link Settings cog.
4. If the default option is “People you choose”, you’re safe.
5. If it says “People in your organisation”, raise it with your IT team immediately.
6. Instead, use the option to share directly with people you choose

🧭 Final Thought

Copilot is a powerful tool, but it’s only as secure as your organisation’s sharing settings. If you’re not sure what’s been shared, or how your files are protected, take a moment to check. And if something doesn’t look right, speak up.

Remember: Copilot security is important for end users, so make sure you’re aware.