How to manage SharePoint user groups and permissions

Managing SharePoint user groups and permissions can feel like constant cleanup. Someone can’t access a file they need. Someone else has access to things they shouldn’t. A guest account from last year’s project is still active. And every time you fix one issue, another pops up.

It’s easy to treat permissions as routine admin work. But in Microsoft 365, they define your security boundaries—and with tools like Microsoft Copilot, they now also define what your in-house AI can access and surface. When access isn’t structured properly, oversharing creeps in. Former employees keep access, sensitive files end up visible to the wrong people, and Copilot can surface sensitive data to people who were never meant to see it.

In this guide, we’ll break down how modern SharePoint permissions work, how M365 groups shape access, and how to prevent permission drift before it becomes a governance problem.

How SharePoint permissions work

In modern Microsoft 365 environments, permissions are typically managed through groups—not by assigning access to individuals one by one. Most team sites are connected to an M365 group, so adding someone as an owner or member grants them access to the connected SharePoint site automatically. That same membership also affects access across Teams, Outlook, Planner, and other linked apps, which means permissions decisions rarely stay confined to one place.

With Microsoft Copilot operating across these services, a single group membership can give AI access to a wide breadth of files, making permission scope far more impactful than it used to be.

Underneath that structure are the permission levels in SharePoint that define what someone can actually do once they have access.

Permission levels in SharePoint

There are seven default permission levels in SharePoint. Each level defines a different set of actions within a site:

• View Only: View pages, documents, and list items
• Limited Access: Automatically assigned to support inheritance; allows access to specific content and isn’t meant to be managed directly
• Read: View pages and list items
• Edit: Add, edit, or delete lists and documents
• Contribute: Add or modify items
• Design: Create and customize pages, approve content, and manage layouts
• Full Control: Complete administrative access

These permission levels are typically applied through group permissions in SharePoint, rather than assigned directly to individual users. You don’t need to use all seven—in fact, the more permission levels you actively rely on, the harder it becomes to understand who can do what. Reviews take longer, exceptions multiply, and access eventually stops reflecting how people actually work.

When working alongside Copilot, that lack of clarity becomes even more risky. If you can’t easily explain who has access to something, you can’t accurately predict what Copilot might surface in response to a prompt.

Permission inheritance and structure

In SharePoint, permissions are hierarchical. Access set at a higher level flows down unless you intentionally break the chain.

In modern SharePoint, that usually looks like: 

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Site → Library or list → Folder → File

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If a user has access at the site level, they’ll inherit access to everything under it. This structure makes large environments manageable. Instead of configuring permissions on every library or folder, you can define access once for the site and let it cascade from there.

That’s the upside. The downside shows up when inheritance is broken. A single library or folder with unique permissions might solve a short-term problem, but over time those exceptions stack up. A few unique permissions turn into dozens. Eventually, it becomes difficult to see where access differs from the site default. 

This is where permission sprawl takes hold. The more exceptions you create, the harder it is to answer that core question: Who has access to what—and why? With Copilot following the permissions you outline, broken inheritance creates unpredictable exposure paths that could leave your sensitive data exposed.

Direct permissions vs. group-based permissions

SharePoint allows you to assign permissions directly to individual users. But while that flexibility is useful, it comes with tradeoffs.

Individual permissions are harder to see at a glance and easier to overlook during reviews. A handful of one-off access decisions across multiple sites can quickly become difficult to track.

Managing access through groups keeps your structure centralized. Instead of checking permissions site by site, you review group membership and make changes in one place. 

The takeaway? Use direct permissions only when there’s a clear reason. The fewer exceptions you create, the easier permissions are to manage long-term.

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How to manage permissions for groups in SharePoint

In SharePoint, groups are the key to organizing access at scale. Instead of assigning permissions user by user, you manage membership and let group permissions define what members can do.

Below, we’ll walk through the steps for managing groups in SharePoint. No matter which setup you’re using, remember that reviewing membership regularly keeps permissions accurate and easier to manage.

To review or update access for a modern team site:

1. Go to the Microsoft 365 admin center

2. Navigate to Teams & groups → Active teams & groups

3. Select the group connected to your site

4. Add or remove owners and members

Changes apply automatically to the connected SharePoint site.

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Common issues with permissions on SharePoint (and how to fix them)

Even with a clean structure in place, SharePoint permissions tend to drift as the environment grows. Here are some of the most common issues and how to address them.

Broken inheritance

To check for broken inheritance:

1. Navigate to the library, folder, or file

2. Open Settings → Manage access

3. Look for indicators of unique permissions

4. If appropriate, remove unique permissions to restore inheritance

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Software like ShareGate Protect help surface permissions across your environment so you can see where inheritance has been broken and decide whether those exceptions are still necessary.

Overexposure of access

Say someone on your team needs access to a file. You grant it quickly to avoid a bottleneck. A few months later, their role changes, but their access stays the same. Multiply that by dozens of users and hundreds of sites, and it becomes very hard to know who truly needs what. 

Overexposure usually builds gradually—a result of direct permissions sticking around, temporary access becoming permanent, and high-permission groups growing without regular review. That overexposure becomes a risk in day-to-day operations if your users unknowingly retrieve sensitive data via Copilot, surfacing something you’d rather keep private. 

Reporting tools like ShareGate Protect help surface where users have unique or elevated permissions so you can review access more efficiently and decide what needs adjustment.

External sharing and guest access

External sharing is a normal part of modern work. Vendors, contractors, and partners often need access to specific content in SharePoint.

This risk isn’t sharing itself. It’s losing track of where that access exists.

Guests may be added through M365 groups, shared links, or direct file permissions. Over time, those access points accumulate. Access often doesn’t get revisited when projects end or contracts change.

With native tools you have to manage external sharing by:

• Reviewing guest accounts in Microsoft Entra ID
• Checking site-level sharing settings in the SharePoint admin center
• Auditing shared links for sensitive libraries

Jumping from one review to another to another makes it hard to maintain visibility across your tenant and to feel sure nothing’s falling through the cracks. Solutions like ShareGate Protect provide centralized insight into guest access and help you review external permissions more efficiently.

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4 best practices for managing permissions on SharePoint

Here are a few best practices that make long-term SharePoint permissions management easier. While these strategies have always been important, they’re now essential as companies become AI-enabled. With Copilot in the picture, well-structured permissions actively limit what your AI systems access, interpret, and share with users in your organization.

Building safeguards ahead of time will help prevent you from running into any sticky situations with AI compliance and data security.

1. Design for scale, not one-off requests

It’s tempting to solve each access request individually. But that approach will eventually create fragmentation.

Favor structures that scale—clear group ownership, consistent permission levels, and limited exceptions. What works for 10 users rarely works for 1,000.

2. Limit (and document) exceptions

Breaking inheritance or assigning direct permissions isn’t inherently wrong. But every exception introduces complexity.

When exceptions are necessary, document the reason. That context becomes critical during audits or role changes.

3. Separate ownership from membership

Group ownership should be intentional. Owners can change permissions and membership, so that role should be assigned carefully and reviewed periodically. Clear ownership will prevent unmanaged growth of high-permission groups.

4. Build reviews into your process

Permissions drift because reviews are reactive instead of scheduled. Make access reviews part of your operational rhythm—quarterly, biannually, or aligned with major organizational changes. Consistency matters more than frequency.

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Strengthen your SharePoint governance with ShareGate Protect

Managing permissions in SharePoint gets more complex as your M365 environment grows. As new sites are created, groups evolve, and guest users get added, it becomes harder to maintain a clear view of who has access to what. With Copilot relying on those same permissions to surface and summarize content, any lack of visibility quickly becomes an operational security risk.

ShareGate Protect provides centralized insight into external sharing, guest access, and risky permission configurations across your tenant. Instead of reviewing sites individually, you can see where oversharing may exist and evaluate whether current access still aligns with your governance standards.

Want greater visibility into permissions and external sharing across your environment? Start a 15-day free trial of ShareGate Protect and evaluate your tenant’s access landscape for yourself.