Ensure guest access to a site or OneDrive will expire automatically

MediumLevel 1Manual reviewm365

Description

This policy setting configures the expiration time for each guest that is invited to the SharePoint site or with whom users share individual files and folders with. Expiration can be a number 30 to 730. The recommended state is 30. This setting ensures that guests who no longer need access to the site or link no longer have access after a set period of time. Allowing guest access for an indefinite amount of time could lead to loss of data confidentiality and oversight. Note: Guest membership applies at the Microsoft 365 group level. Guests who have permission to view a SharePoint site or use a sharing link may also have access to a Microsoft Teams team or security group.

How it is checked

Audit method: Manual review

This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.

To audit using the UI: 1. Navigate to SharePoint admin center https://admin.microsoft.com/sharepoint 2. Expand Policies > Sharing. 3. Scroll to and expand More external sharing settings. 4. Verify that Guest access to a site or OneDrive will expire automatically after this many days is checked and set to 30. To audit using PowerShell: 1. Connect to SharePoint Online service using Connect-SPOService. 2. Run the following cmdlet: Get-SPOTenant | fl ExternalUserExpirationRequired,ExternalUserExpireInDays 3. Verify the following values are returned: o ExternalUserExpirationRequired is True. o ExternalUserExpireInDays is 30.

How it is fixed

Fix method: Guidance or infrastructure patch

To remediate using the UI: 1. Navigate to SharePoint admin center https://admin.microsoft.com/sharepoint 2. Expand Policies > Sharing. 3. Scroll to and expand More external sharing settings. 4. Set Guest access to a site or OneDrive will expire automatically after this many days to 30 To remediate using PowerShell: 1. Connect to SharePoint Online service using Connect-SPOService. 2. Run the following cmdlet: Set-SPOTenant -ExternalUserExpireInDays 30 -ExternalUserExpirationRequired $True

Properties

Operating systems: Any
Tags: access-controlm365saas
Reference: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 7.2.9 Ensure guest access to a site or OneDrive will expire automatically