Set Default Sharing to “People with Existing Access” in SharePoint Online

This post will explain how to set default sharing of all SharePoint sites in the tenant to “Poeple with Existing Access”.

Introduction

From a security standpoint, it is important to protect access to information to ensure that only the right people in an organization has access to it.

Users can share files and folders in Microsoft SharePoint by sending a link. They should select a link type based on the people to whom they want to give permission. The following link types are available:

• Anyone with the link (previously called “anonymous access” or “shareable”)
• People in your organization with the link
• People with existing access
• Specific people

By default, default sharing is configured to “People in [Organization”], meaning that when sharing or making use of the “Copy link” option to share a document with someone, the link you provide may be accessed by the whole organization. To prevent this, we can change the default sharing to “Poeple with Existing Access”, meaning that when sharing or making use of the “Copy link” option to share a document with someone, the link you provide may be accessed by people that already have access to the document, making it a more secure way to share a document with someone.

The Code

The PowerShell script below allows you to change the default sharing to “People with Existing Access” for all sites in your tenant.

NOTE: For now,

Import-Module Microsoft.Online.SharePoint.PowerShell -DisableNameChecking

$AdminSiteUrl = "https://dev-admin.sharepoint.com"

#Connect to SharePoint Online
Connect-SPOService -Url $AdminSiteUrl

#Get All SharePoint Sites
$Sites = Get-SPOSite -Limit All

#Iterate each site and change the default sharing
ForEach ($Site in $Sites)
{
    $SiteUrl = $Site.URL
    Write-Host "Setting Sharing to DefaultLinkToExistingAccessin $SiteUrl" -ForegroundColor "Green"
    Set-SPOSite -identity $SiteUrl -DefaultLinkToExistingAccess 1
}

Sharing experience before running the script:

Sharing experience after running the script:

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