How to Secure SharePoint Files and Folders Using Permission Groups

Knowing how to secure SharePoint files and folders correctly is one of the most important steps in protecting sensitive business data. SharePoint is powerful, but when permissions are set incorrectly, files can easily be overshared, exposed, or accessed by the wrong people.

In this guide, we explain the group-based permission method — the safest and most scalable way to secure SharePoint files and folders — and why avoiding individual file sharing is critical for long-term security.

Why Securing SharePoint Files and Folders Matters

Many WA businesses assume SharePoint is secure by default. While Microsoft provides a strong security foundation, how you configure permissions determines whether your data is truly protected.

Common SharePoint security risks include:

• Users sharing files externally without approval
• Broken permission inheritance
• Folder-level security being bypassed
• No visibility over who has access to what

If you’re unsure about your current setup, our SharePoint consulting services in Perth can help assess and remediate risks.

The Best Practice Method to Secure SharePoint Files and Folders

The gold standard approach to secure SharePoint files and folders is using permission groups, not individual users.

Step 1: Secure the Document Library First

Every SharePoint document library should have one primary permission group assigned at the library level.

Example:

• Library name: Finance Documents
• Permission group: Finance Library – Members

Only add users to the group — never directly to the library. This makes access easier to audit, manage, and secure.

Step 2: Secure Root Folders Inside the Library

Within the document library, create main root folders and assign a separate permission group to each.

Example structure:

• Finance Documents
  • Payroll (Payroll Access Group)
  • Invoices (Invoices Access Group)
  • Budgets (Management Access Group)

This layered approach ensures only authorised users can access sensitive folders while keeping the overall library clean and secure.

Step 3: Subfolders Should Inherit Permissions

Once root folders are secured, allow subfolders to inherit permissions wherever possible.

Breaking inheritance too deeply creates complexity and increases the risk of misconfigured access — one of the most common reasons SharePoint data leaks occur.

The Hidden Risk of Sharing Files in SharePoint

Here’s a critical point many businesses miss:

Sharing a file can break folder permission inheritance.

When a user clicks Share on a file, SharePoint may create unique permissions on that file. This means:

• The file may become accessible to users who do NOT have folder access
• Folder security is no longer a reliable indicator of who can access the file
• Auditing access becomes significantly harder

While sharing does not overwrite folder permissions, it does bypass them at the file level — which is often worse.

This is why Microsoft and security professionals recommend group-based access over file sharing.

For deeper insight, see Microsoft’s official guidance on permissions:
Microsoft SharePoint Permission Levels

How to Secure SharePoint Files and Folders at Scale

To properly secure SharePoint files and folders across your organisation:

• Use security groups — never individual users
• Lock down document libraries first
• Apply permissions only at key folder levels
• Restrict file sharing permissions
• Review access regularly

Security also depends on backups. Learn why Office 365 backups are essential for SharePoint protection.

Related SharePoint Security Reading

• Is My Data Safe in SharePoint? 2026 Security Checklist
• Secure Access to Business Data When Working Remotely
• Microsoft 365 Solutions for WA Businesses

Frequently Asked Questions: Securing SharePoint Files and Folders

Is it safe to share files directly in SharePoint?

Direct file sharing can create unique permissions that bypass folder security. Group-based access is safer and easier to manage.

Should I use folders or separate document libraries?

Use separate libraries for major data categories. Use folders only when necessary and keep permissions simple.

How often should SharePoint permissions be reviewed?

At least quarterly, or whenever staff roles change.

Need Help Securing Your SharePoint Environment?

If you want expert help to secure SharePoint files and folders properly, our team can help.

Talk to a SharePoint Security Specialist

You can also explore our IT consulting services or managed IT support for ongoing protection.