Groups with external owners

Last updated Oct 17, 2026 Policies Access & Sharing

AI summary

Groups owned by external users pose security and compliance risks through uncontrolled membership changes and unauthorized data access. Rencore Governance helps identify such groups in Microsoft 365 so you can transfer ownership to trusted internal users.

Severity: High Security Generally available

What it detects

Shows groups that have external users as owners.

Why it matters

External users owning internal groups can make uncontrolled membership changes, access sensitive information, and create compliance risks beyond your organization's direct control. Immediately transfer ownership of all externally-owned groups to trusted internal users, use Rencore Governance to continuously monitor and alert on any policy violations to maintain security and governance standards.

The rule

Every Group that has any Group Owners where Is External is true

In Rencore Governance

Details

Applies to	Group
Connector	Microsoft 365
Severity	High
Category	Security
Recommended	No
Recommended automation	None
License type	Standard

Other policies that check Group objects:

Groups with disabled user accounts (Medium)
Groups with external users (Medium)
Groups with very few owners (Medium)

Frequently asked questions

What does the groups with external owners policy detect?

The Groups with external owners policy shows groups that have external users as owners.

Which objects does the groups with external owners policy check?

The Groups with external owners policy checks Group objects from the Microsoft 365 inventory and reports each one that matches its rule as a violation.

How severe is a violation of the groups with external owners policy?

Violations of the Groups with external owners policy have High severity. The policy is in the Security category.

Which module includes the groups with external owners policy?

The Groups with external owners policy comes with the Microsoft 365 connector in the Digital Workplace module of Rencore Governance, which every Plan includes.

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