How to Guide Clients Through Migrating from Open Shares to Secure Group Access

Many Small and Medium-sized Businesses (SMBs) and public sector organizations still use open file share setups with broad access permissions. This setup creates risk. It exposes data, increases the chance of insider threats, and fails compliance checks.

Migrating to secure group-based access addresses these issues and helps MSPs show governance maturity. This guide shows you how to move clients from open shares to secure group access for long-term security.

Steps to migrate from open shares to secure group access

Here are the requirements you need in place for a smooth process.

📌 General prerequisites:

• Inventory of current open shares and their associated permissions (via PowerShell, file server reports, or Microsoft 365 exports).
• Defined group structures in Active Directory or Microsoft Entra ID (Azure AD).
• Knowledge of organizational roles and data sensitivity.
• Backup of existing access configurations for rollback if needed.
• Stakeholder approval from department managers or data owners.

Step 1: Identify and audit open shares

Start by knowing what you’re dealing with. The first step is understanding the scope of the problem. Run an open share audit to see which folders are open to broad groups, who has access, and the level of risk. The data becomes the basis for every step that follows.

📌 Use Cases: Preparing for a security audit or a compliance check

📌 Prerequisite: Admin-level access to file servers or domain controllers

Sub-steps:

1. Use PowerShell to list all shared folders and permissions:

Get-SmbShare | Get-SmbShareAccess

2. Look for any shares where Everyone or Authenticated Users have access.

💡 These are open, overly permissive shares.

3. Record the share name, path, and access level.
4. Map each open share to a data sensitivity category:
   • Public/Low Risk
   • Internal/Medium Risk
   • Confidential/High Risk
   • Restricted/Critical
5. Save your findings in a spreadsheet or database to support later steps.

Step 2: Map users to groups based on business roles

Once you know which shares are exposed, define who should have access and why. Map users into role-based groups that match business functions. This keeps access consistent and easier to manage.

📌 Use Cases: Implementing least privilege access.

📌 Prerequisite: Admin access to Active Directory or Microsoft Entra ID (Azure AD).

Sub-steps:

1. Work with HR or department managers to review job roles and responsibilities.
2. Identify who needs access to which types of data.
3. Create or update AD or Microsoft Entra ID (Azure AD) groups based on these mappings.
4. Avoid one-to-one assignments. Add users to groups that hold the permissions instead.
5. Assign a group owner who approves future access requests.

Step 3: Build a migration plan

This step builds the roadmap. Create a clear plan to ensure a smooth and correct migration from open shares to secure group access, aligned with business needs and free from disruption.

📌 Use Cases: Transitioning to role-based access control

📌 Prerequisites: Completed audit of open shares (Step 1) and defined role-based groups (Step 2)

Sub-steps:

1. Define migration phases:
   • Phase 1: Inventory and documentation of open shares.
   • Phase 2: Group creation and validation.
   • Phase 3: Test migrations with non-critical folders.
   • Phase 4: Full migration with rollback option.
2. Communicate the plan and expected timelines to department managers and stakeholders.

Set clear expectations:

• • What’s changing
  • When it’s happening
  • Who to contact if issues arise

Step 4: Migrate permissions to secure groups

It’s time for the execution. This step replaces broad permissions with role-based group access, reducing exposure and moving your organization closer to least privilege access.

📌 Use Cases: Replacing “Everyone” access on legacy file servers with AD groups.

📌 Prerequisites:

• Completed migration plan (Step 3).
• Role-based groups created and validated (Step 2).
• Backup or snapshot of current permissions.

Sub-steps:

1. Replace Everyone or Authenticated Users with least-privilege groups on a per-folder basis.
2. Begin with folders that don’t contain sensitive or business-critical data.

💡 Validate success before moving on to sensitive folders.

3. Keep a read-only copy of the original share during the transition.
4. Confirm that users in the new groups have the access they need.
5. Progressively migrate higher-risk folders.
6. Document changes in a migration log with before and after permissions.

💡 Record what was changed, when, and by whom.

Step 5: Validate and review access post-migration

Check that changes were applied correctly. Confirm open shares are removed, users still have the right access, and managers approve the results before closing the migration.

📌 Use Cases: Finalizing a secure access migration.

Sub-steps:

1. Re-run permission exports to confirm open shares are removed.
   • Use PowerShell or third-party tools to re-scan folder permissions.

Get-SmbShare | Get-SmbShareAccess | Where-Object { $_.AccountName -match "Everyone|Authenticated Users" }

2. Send updated access reports to department owners for approval.
3. Log results in a Permission Migration Register. Record:
   • Actions taken
   • Migration date
   • Department owner approval
   • Any issues or exceptions

Step 6: Embed into ongoing governance

After migration, keep access under control. In this step, you schedule reviews, maintain logs, and automate updates, making access management sustainable and compliant over time.

📌 Use Cases: Building sustainable governance frameworks.

Sub-steps:

1. Schedule quarterly or semi-annual permission reviews with department managers.
   • Confirm that group memberships still align with job roles and business needs.
2. Document all permission changes, approvals, and exceptions.
   • Maintain audit logs for compliance.
3. Use the migration as a springboard for broader identity and access management (IAM) improvements.
   • Integrate with identity governance platforms (e.g., Microsoft Entra ID or Okta)
   • Automate group membership updates based on HR data.

Best practices summary table

Use this table to keep your migration focused and efficient. Each best practice supports a specific outcome and helps avoid common mistakes.

Automation touchpoint example

You can automate checks to reduce manual work and catch issues faster. These help you maintain control over folder permissions.

• Automate quarterly PowerShell exports of share permissions.
• Compare results against your baseline secure group assignments.
• Run periodic automations to detect ‘Everyone’ entries in Access Control Lists (ACLs).

NinjaOne integration

NinjaOne can support secure share migrations across client environments by automating key tasks and centralizing documentation.

Migrate from open shares to secure group access for stronger security

Migrating from open shares to secure group access reduces risk, enforces least privilege, and strengthens compliance. You do this by auditing permissions, mapping roles to groups, and validating changes with stakeholders.

Migrate gradually, keep rollback options, and document results. Use RMM tools like NinjaOne to automate detection, reporting, and ongoing governance. This lets MSPs modernize file access while avoiding disruption to daily operations.

Related topics:

• Quick Guide: How to View All Network Shares on a Windows PC
• Understanding and Implementing Azure RBAC
• User Roles and Permissions