Rencore
Oversharing Control for Microsoft 365
Detect and remediate overshared content across SharePoint, OneDrive, Teams, and Microsoft 365 Groups. Fix permission sprawl before Copilot turns dormant oversharing into active data exposure, with pre-built policies covering 80+ service types.
Oversharing control is the continuous detection and remediation of content shared more broadly than intended across Microsoft 365. Anonymous links, stale guest accounts, inherited permissions, and 'Everyone except external users' grants create invisible exposure that becomes critical when Microsoft 365 Copilot enters the environment. Rencore scans sharing permissions across 80+ service types, flags violations against organizational policies, and provides automated remediation, revoke, restrict, or route to an owner for attestation.
The dormant risk Copilot activates
Most organizations have years of accumulated sharing decisions embedded in their Microsoft 365 environment. A SharePoint site shared with “Everyone except external users” three years ago. A Teams channel where a guest account was never revoked after a project ended. An anonymous link to a confidential document that was meant to be temporary.
Before Copilot, these permissions represented dormant risk, the content sat in folders nobody browsed. With Copilot, every overshared document is one natural-language prompt away from surfacing in a response. The permission model has not changed, but the accessibility model has.
Why quarterly audits are not enough
Permission changes happen continuously. A user shares a folder broadly to unblock a deadline. An admin grants a security group access to a site during a migration and forgets to revoke it. A guest account that should have expired remains active because nobody owns the review.
Point-in-time audits catch what was wrong on audit day. They miss what happened the day after. Rencore’s continuous delta scanning detects permission changes as they occur, flagging new violations in minutes, not months.
Remediation at scale
Identifying oversharing is necessary. Fixing it is what reduces risk. Rencore provides automated remediation actions, revoke anonymous links, downgrade broad permissions, expire stale guest access, that execute based on policy rules or route through approval workflows when human judgment is needed. The IT team handles exceptions and escalations, not the entire backlog of 10,000 overshared resources.
How to start
Run an oversharing assessment on your Microsoft 365 tenant. Rencore’s pre-built policies detect the most common oversharing patterns across SharePoint, OneDrive, Teams, and Groups within hours of connecting your tenant. The assessment quantifies exposure by service, site, and sensitivity level, giving your CISO the data needed to prioritize remediation and greenlight Copilot rollout.
"We cannot roll out Copilot until we know what content is overshared. The board wants AI productivity, but not at the cost of a data breach."
"Every anonymous link is a potential incident. We need to see them all, across every site, without running scripts."
What Rencore does
Detect
- Anonymous and org-wide sharing links
- Stale guest accounts beyond retention period
- Inherited permissions on sensitive sites
- Copilot-surfaceable overshared content
Remediate
- Revoke anonymous links automatically
- Downgrade broad permissions to specific groups
- Expire guest access after configurable period
- Route exceptions to owner approval workflows
Evidence
- Auditor-ready oversharing reports
- Access review completion tracking
- SIEM streaming for oversharing events
- Historical trend reporting for compliance
"As with all organizations, we want to use every option available to ensure secure data in Microsoft 365 and minimize the risk of unauthorized access where possible."
— Greg Bowles , Infrastructure Team Leader · Specialist Risk Group
Frequently asked questions
What is oversharing in Microsoft 365?
How does Microsoft 365 Copilot amplify oversharing risks?
How does Rencore detect oversharing?
What is Copilot governance?
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