How to Audit Microsoft 365 Permissions Before Rolling Out Copilot

Key Takeaways

• A Microsoft 365 permissions audit before Copilot involves finding and fixing existing data exposure before AI surfaces it to every user. Copilot does not create new access, it surfaces whatever a user can already reach.
• Nearly 89.5% of organizations experienced at least one generative AI-related security breach over the previous 12 months, up from 75.1% in 2025.
• A pre-Copilot audit should identify overshared content, unclassified sensitive data, stale guest users, inactive workspaces, and broken permission inheritance.
• A complete audit assesses what is exposed, cleans up access to a just-enough baseline, and maintains that baseline as content grows.
• Scope the audit to the workspaces being Copilot-enabled first. A 100% tenant audit before rollout is a project that never ends.
• Permissions drift back within months without ongoing enforcement. Automation, not a one-time cleanup, is what makes an audit durable.
• AvePoint Insights manages discovery and risk-ranking, and AvePoint Policies handles cleanup, enforcement, and recertification — turning a one-time audit into an ongoing posture.

How to Audit Microsoft 365 Permissions Before Copilot: A 3-Step Guide

Auditing Microsoft 365 permissions before Copilot means finding and fixing data exposure that already exists, before AI surfaces it to every user. Copilot does not create new access — it surfaces whatever a user can already reach. If oversharing is not fixed first, Copilot makes the existing problem far more visible.

Why Is a Permissions Audit the Missing Step Before Copilot?

A permissions audit is the missing step because Copilot inherits user access. Any oversharing, stale guest, broken permission, or sensitive document with broad access becomes a discoverable answer the moment Copilot is enabled.

The scale of the problem is already visible in the data. According to AvePoint’s 2026 State of AI Report, 89.5% of organizations experienced at least one generative AI-related security breach over the previous 12 months, up from 75.1% in 2025.” Most Microsoft 365 tenants have permissions issues that have accumulated over years: legacy SharePoint sites with company-wide access, Teams created with default settings nobody reviewed, guests who joined for a project and were never removed, and sensitive files saved to general-purpose libraries.  

The pre-Copilot phase is the moment to clean this up. Once Copilot is on, those gaps are not theoretical — they show up as answers.

What Data Risks Should a Microsoft 365 Copilot Permission Audit Find?

A good audit finds five categories of risk that materially affect Copilot output quality and security posture.

• Overshared content: Files and sites with broader access than the content requires (e.g., HR documents in a general library).
• Sensitive data without classification: Documents containing personally identifiable information (PII), financial data, or contract terms that have no sensitivity label and no data loss prevention (DLP) coverage.
• Stale guest users: External users who retain access months after their project ended.
• Inactive workspaces: Teams and sites with no owner and no recent activity, still holding indexable content.
• Broken inheritance: SharePoint permissions that no longer reflect the intended access model.

A complete pre-Copilot permissions audit follows three steps: assess what is exposed, clean up access to a just-enough baseline, and maintain that baseline as content grows.

Step 1: Run a Risk Assessment Before Copilot

The risk assessment establishes a baseline of where sensitive data lives, who can reach it today, and what would change the moment Copilot is enabled. The goal is a prioritized list of fixes, not a complete inventory.

Focus the assessment on workspaces that will be Copilot-enabled first. Scope ruthlessly — a 100% tenant audit before Copilot rollout is a project that never ends.

AvePoint Insights automates this discovery: it scans tenants for sensitive content, identifies overshared files, surfaces stale guests, and ranks workspaces by exposure risk. The output is a list of the workspaces that need cleanup before they should be Copilot-eligible.

Step 2: Clean Up Permissions and Enforce Just-Enough Access

This step closes the gaps the assessment surfaced. The cleanup target is just-enough access: Every user can reach what their role requires, and nothing else.

Cleanup work breaks into four practical tasks:

• Remove the "all_company" or "everyone except external users" groups from Teams and sites that shouldn't have them.
• Re-permission overshared sensitive content to the smallest viable group.
• Remove or expire stale guest users; require sponsor-based renewal for any guest staying longer than 90 days.
• Reset broken SharePoint inheritance to the parent site model unless a documented exception exists.

AvePoint Policies automates this layer. It applies the cleaned baseline across tenants and prevents drift back to the old state. Without ongoing enforcement, permissions return to their previous shape within months.

Step 3: Maintain Permissions After Copilot Rollout

This step keeps the baseline intact as content grows. Copilot does not change the rate at which workspaces are created, guests are added, or sensitive content is uploaded — it just raises the cost of every mistake.

Ongoing maintenance has three components: continuous scanning for new exposures, automated remediation for known patterns, and periodic recertification of access for high-sensitivity workspaces.

This is where most permission audits fail. The cleanup gets done once and then drift is allowed to return. Automation is what makes the audit durable.

How AvePoint Prepares Microsoft 365 Permissions for Copilot

AvePoint Insights handles the discovery and risk-ranking layer of the audit. AvePoint Policies handles cleanup, ongoing enforcement, and recertification. Together, they turn a one-time audit into an ongoing posture.

For organizations that already use Microsoft Purview, AvePoint adds the workspace-lifecycle and remediation layer that Purview's labels and DLP policies depend on for consistent enforcement.

Microsoft 365 Permissions Audit Checklist Before Copilot

• Inventory sensitive content across the workspaces planned for Copilot enablement.
• Identify and re-permission overshared files and libraries.
• Remove or recertify stale guest users.
• Reset broken SharePoint permission inheritance.
• Apply sensitivity labels to high-risk content.
• Configure DLP coverage for Copilot-eligible workspaces.
• Stand up ongoing monitoring for new oversharing events.
• Schedule access recertification for owners of sensitive workspaces.

Frequently-Asked Questions

What does Copilot have access to in Microsoft 365?

Microsoft 365 Copilot has access to whatever the signed-in user has access to: their mail, chats, files in OneDrive, and SharePoint sites and Teams they are members of. Copilot does not bypass permissions, but it does surface content the user could reach but rarely opens.

Why should I audit Microsoft 365 permissions before turning on Copilot?

Auditing permissions first prevents Copilot from surfacing content that was technically accessible but practically forgotten – overshared files, stale Teams, sensitive documents in general libraries – to every user the moment AI is enabled.

What are the biggest Microsoft 365 permission risks for Copilot?

The main risks are overshared sensitive content, stale guest access, unmanaged Teams and SharePoint sites, broken permission inheritance, and sensitive documents without sensitivity labels or DLP coverage. Overshared content is typically the largest category by volume — and the one Copilot surfaces first.

Do I need to worry about anything else Copilot may have access to besides data?

Copilot does not just have access to your organization’s data. It also has visibility into apps, flows, team sites, groups, conversations, and much more. You need to go beyond your files to truly secure your environment.

How long does a Copilot permissions audit take?

A focused audit scoped to the workspaces being Copilot-enabled typically takes days, not weeks or months. It is recommended to take this approach rather than a tenant wideaudit which could bog teams down in endless remediation.

Do I need a third-party tool to audit Microsoft 365 permissions before Copilot?

Native Microsoft tools can surface some issues, but automated discovery, risk ranking, and ongoing enforcement across many workspaces typically require a dedicated tool. AvePoint Insights and AvePoint Policies are built for this workflow. 

Go Beyond AI Readiness

Secure data and accelerate adoption by assessing, cleaning, and maintaining permissions for Copilot-enabled workspaces, enabling AI initiatives to scale without compromising trust or compliance.