SharePoint and OneDrive are where a lot of an organization's data actually lives — and where a lot of it quietly becomes too accessible. "Oversharing" is the catch-all term: content that more people can reach than anyone intended, through loose links, inherited permissions, or external sharing settings nobody reviewed.
It has always been a top audit finding. Copilot has made it urgent: assistants surface content based on permissions, so oversharing becomes a data-exposure problem as well as a governance one.
This post covers how to audit permission sprawl in SharePoint and OneDrive.
What oversharing actually is
Oversharing comes from several different mechanisms:
- Anonymous links. "Anyone with the link" content that unauthenticated users can open, bypassing every identity control.
- "Everyone" and "Everyone except external users" groups. Broad internal reach that is easy to grant and hard to track.
- Broken inheritance with no cleanup. A site breaks permission inheritance for a project and the extra access never gets removed.
- External sharing at the site level. Sites loosened for collaboration and left loose.
- Orphaned permissions. Access belonging to departed employees or ended projects.
A permission-sprawl audit looks for all of these — not just whether external sharing is "on," but how much content is actually reachable and by whom.
Why the defaults matter so much
Two tenant-wide defaults do most of the work:
1. The external sharing scope. This is the ceiling for every site. If the tenant allows "Anyone with the link," then any site owner can create anonymous links, and the only thing standing between sensitive content and the public internet is individual users' choices.
2. The default link type. If new links default to anonymous, oversharing requires no decision at all — it is the path of least resistance. If they default to internal, staying safe is the default.
Changing these two settings reduces oversharing more than almost anything else, because it removes the accidental paths.
How to audit permission sprawl
A practical audit covers, in order:
- Tenant external sharing scope — is it set to the minimum the business can tolerate?
- Default link type and permission — internal/View, not anonymous/Edit?
- Site-level overrides — which sites have been loosened above the tenant floor?
- Broad access groups — where is "Everyone" used, and is it justified?
- Anonymous link inventory — how much content is reachable without authentication?
- Stale permissions — access belonging to former users and finished projects.
At scale, this is a permissions-reporting problem. SharePoint has reporting for sharing and access, but making sense of it across a tenant is real work. Automated, read-only checks evaluate the tenant and site settings and flag the risky configuration against controls.
The Copilot angle
Copilot does not invent access — it surfaces content the signed-in user can already reach. Which means every oversharing problem you have today becomes a Copilot exposure the day you roll it out.
That is why Copilot readiness and oversharing auditing are the same conversation: before you turn on an assistant that can read everything a user can read, you want to know what that actually is.
The short version
SharePoint and OneDrive oversharing is a top risk because the defaults make it easy and the sprawl is hard to see. Audit the tenant sharing scope, the link defaults, the site overrides, and the stale permissions — then tighten the defaults so the safe path is the easy path. With Copilot on the horizon, do it sooner rather than later.
Run an audit to assess external sharing and link defaults across SharePoint and OneDrive, alongside every other surface.