Microsoft 365 Copilot only accesses information users already have permission to see. The challenge is that many organisations have years of accumulated permissions, shared files, and forgotten access rights that nobody has properly reviewed. Before rolling out Copilot, businesses should audit permissions, review sharing settings, and classify sensitive data to reduce the risk of unintended information exposure.
AI tools like Microsoft Copilot promise significant productivity gains, helping employees find information faster, draft content, and automate everyday tasks.
But before enabling Copilot licences across your organisation, there’s an important question to answer:
Are your Microsoft 365 permissions actually under control?
Copilot works within your existing Microsoft 365 environment. It doesn’t create new permissions or unlock data users couldn’t previously access. Instead, it uses the permissions already assigned to each employee to retrieve files, emails, chats, meeting notes, and documents.
The problem is that many businesses have never fully reviewed who can access what.
Years of staff changes, project work, shared folders, and ad-hoc permissions can create an environment where access is far broader than intended.
That’s why permission reviews should always come before a Copilot rollout.
How Microsoft Copilot Accesses Information
Microsoft Copilot retrieves information through Microsoft Graph, which connects services across Microsoft 365.
When a user asks Copilot a question, it can pull information from:
- Outlook emails
- Calendars
- SharePoint documents
- OneDrive files
- Teams chats
- Meeting transcripts
Importantly, Copilot can only access content that the signed-in user already has permission to view. That sounds reassuring, but it also highlights the real risk.
If permissions have drifted over time, Copilot can surface information employees may technically have access to, but shouldn’t realistically still be seeing.
Why Permission Creep Happens
Permission issues rarely happen because someone deliberately grants excessive access.
They happen because access accumulates over time – an employee is added to a project team, a folder is shared temporarily, a Teams channel is created for a specific initiative, a project ends, but the permissions remain…
Multiply this across several years of staff changes, departmental moves, and collaborative projects, and it becomes difficult to know exactly who can access what.
This issue is often referred to as permission creep.
Without regular reviews, employees can end up with access to information far outside their current role. And if they can access it, Copilot can potentially use it.
What Could Copilot Surface?
The concern isn’t that Copilot creates new security risks. The concern is that it makes existing permission issues much easier to discover.
For example, Copilot could potentially return:
- Salary information stored in HR documents
- Confidential financial reports
- Client contracts and proposals
- Performance reviews
- Sensitive project discussions
- Commercial pricing information
In each case, the issue isn’t Copilot itself.
The issue is that the user already had access to information they shouldn’t have retained access to. Copilot simply makes that information easier to find.
Why Small Copilot Pilots Can Still Create Risk
Many organisations assume a small pilot programme eliminates risk.
Unfortunately, that’s not always the case. Pilot users are often:
- Directors
- Partners
- Senior managers
- Department heads
These employees typically have broader access rights than anyone else in the business.
As a result, a small pilot involving senior staff can sometimes expose more information than a wider rollout involving carefully selected users.
Before assigning licences, it’s important to understand not just who will use Copilot, but what information they can currently access.
Four Checks to Complete Before Enabling Copilot
1. Review SharePoint Permissions
SharePoint is often where oversharing occurs.
Review:
- Site permissions
- Shared folders
- Legacy project sites
- Large permission groups
Look for areas where access has expanded over time without proper review.
2. Audit External Sharing
Many businesses regularly share files with clients, suppliers, and contractors.
Review external sharing links and identify:
- Files still shared unnecessarily
- Expired projects
- External users who no longer require access
This helps reduce both security and compliance risks.
3. Check Teams Membership
Teams channels often grow organically during projects.
Over time, members may remain in channels long after their involvement has ended.
Reviewing Teams membership can quickly identify unnecessary access to files and conversations.
4. Apply Sensitivity Labels
Not all information should be treated equally.
Microsoft Purview Sensitivity Labels allow businesses to identify and protect:
- Financial data
- HR records
- Client information
- Legal documents
- Commercially sensitive content
Classification helps ensure the right controls are applied before AI tools begin surfacing information more efficiently.
The Question Every Business Should Ask Before Deploying Copilot
Before purchasing licences or launching a pilot, ask your IT provider:
“Can you show us which files containing sensitive business information are accessible to large groups of employees?”
The answer can reveal a lot about your organisation’s readiness for AI adoption.
If permissions haven’t been reviewed recently, that work should happen before Copilot deployment begins.
A permissions audit doesn’t just improve security. It also helps ensure Copilot delivers useful, relevant results without exposing information to the wrong people.
AI Readiness Starts with Good Data Governance
Microsoft Copilot can be a powerful productivity tool, but successful deployment depends on having the right foundations in place.
Before enabling licences, review permissions, clean up oversharing, audit collaboration tools, and classify sensitive information.
The organisations seeing the greatest value from Copilot are the ones that invest time in preparing their Microsoft 365 environment first.
👉 Thinking about deploying Microsoft Copilot in your business? Our team can help assess your Microsoft 365 environment, review permissions, and ensure your organisation is ready to adopt AI securely and confidently. Reach out to us today!
Article used with permission from The Technology Press.
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