How to Use Graph Explorer to Reveal Real Access, Risky Relationships, and Sensitive Data Paths

The Hidden Map Connecting Users and Files in Microsoft 365

If you think your sensitive data is “locked down” just because SharePoint, Teams, and OneDrive all show reasonable permissions, you are probably staring at three clean snapshots of a very messy reality. In most Microsoft 365 tenants, files quietly move between chats, sites, and personal storage, groups gain new members, and guest access is granted on the fly—creating a web of relationships no single admin view can fully explain. In this episode, you learn how to use Graph Explorer to reveal the hidden map connecting users, groups, and files so you finally see who can really touch your most important content.

We start from the pain every admin and security owner knows: you discover a sensitive document in the wrong place, run a permissions check, and think you understand the risk—only to learn later it was shared in Teams, synced to OneDrive, or exposed through a group membership nobody had on their radar. The default admin tools only show fragments: a site’s permissions here, a group membership list there, a few audit entries somewhere else. You will hear how this fragmented view leads to dangerous blind spots where official access lists and real-world access patterns quietly drift apart.

Then we walk through what changes when you treat Microsoft 365 as a graph of relationships instead of siloed apps. Starting from a single user or file, you follow the chain: which groups they belong to, which sites and Teams those groups touch, which files sit behind those containers, and which sharing links extend access even further. With Graph Explorer, you stop guessing and start tracing: user → groups → sites → files → links → other people—and suddenly the “mystery” of how someone saw a document they should not have becomes a clear, queryable path.

You will also see how this approach scales beyond one-off investigations. By focusing your queries with filters and $select, you can pull exactly the signals you care about—external shares, high-risk folders, newly added users in privileged groups—and feed them into repeatable reviews or even automated checks. Instead of spending hours jumping between admin centers and exports, you learn how to ask targeted questions of the graph and get back precise, actionable answers.

By the end of this episode, you will have a practical mental model and concrete query patterns to move from “I hope our sensitive files are under control” to “I can prove who’s connected to what—and why.” If you are responsible for M365 security, compliance, or tenant hygiene, this conversation will help you stop chasing symptoms in separate tools and start working from the actual map that has been there all along, waiting to be queried.

WHAT YOU LEARN

• Why SharePoint, Teams, and OneDrive admin views only show fragments of real file access.
• How users, groups, and files form a hidden relationship graph inside Microsoft 365.
• How to use Graph Explorer to pivot from a user or file through groups, sites, and sharing links.
• How to narrow Graph queries with filters and $select so you get signals, not noise.
• How to turn ad-hoc investigations into repeatable patterns for risk reviews and audits.

CORE INSIGHT

The core insight of this episode is that your real Microsoft 365 risk lives in the connections—not just in static permission lists. When you use Graph Explorer to map those connections, you finally see how group changes, chats, and shares ripple through your environment and can start managing access based on reality instead of assumptions.

WHO THIS IS FOR

• Microsoft 365 admins responsible for security, compliance, or tenant hygiene.
• Security and risk teams who need to understand who can really access sensitive files.
• Architects and engineers working with Microsoft Graph and automation around permissions.
• Auditors and governance leads who need evidence of actual access patterns, not just static configs.

ABOUT THE HOST

This episode is hosted by Mirko Peters, a Microsoft 365 consultant who helps organizations uncover and control the real relationships between users, groups, and content in their tenants. He focuses on practical ways to use Microsoft Graph, automation, and smart queries to shrink blind spots, tighten access, and give security and compliance teams confidence in what their data map actually looks like.

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