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// graph-permissions · ExternalItem

ExternalItem.ReadWrite.OwnedByMicrosoft Graph permission · Medium risk

Allows the app to read and write external items without a signed-in user. The app can only read external items of the connection that it is authorized to.

Application permission

Medium risk

Read and write external items. Allows the app to read and write external items without a signed-in user. The app can only read external items of the connection that it is authorized to.

ID8116ae0f-55c2-452d-9944-d18420f5b2c8
ConsentAlways needs admin consent
RiskCan make changes. Check the scope is as narrow as possible.

Delegated permission

Medium risk

Read and write external items. Allows the app to read and write external items on behalf of a signed-in user. The signed-in user must be an administrator. The app can only read external items of the connection that it is authorized to.

ID4367b9d7-cee7-4995-853c-a0bdfe95c1f9
ConsentNeeds admin consent
RiskCan make changes. Check the scope is as narrow as possible.

Grant it to an app

In the portal: App registrations › your app › API permissions › Add a permission › Microsoft Graph › Application permissions, then grant admin consent. Or with Graph PowerShell:

powershell5 lines
Connect-MgGraph -Scopes "Application.Read.All", "AppRoleAssignment.ReadWrite.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
$app   = Get-MgServicePrincipal -Filter "appId eq '<your app's client id>'"
New-MgServicePrincipalAppRoleAssignment -ServicePrincipalId $app.Id `
    -PrincipalId $app.Id -ResourceId $graph.Id -AppRoleId "8116ae0f-55c2-452d-9944-d18420f5b2c8"

Ask for it when signing in

Delegated permissions act as the signed-in user, so the app can never do more than that user can.

powershell1 line
Connect-MgGraph -Scopes "ExternalItem.ReadWrite.OwnedBy"

Which apps already have it?

powershell6 lines
# Apps that hold ExternalItem.ReadWrite.OwnedBy as an application permission
Connect-MgGraph -Scopes "Application.Read.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
Get-MgServicePrincipalAppRoleAssignedTo -ServicePrincipalId $graph.Id -All |
    Where-Object AppRoleId -eq "8116ae0f-55c2-452d-9944-d18420f5b2c8" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for ExternalItem.ReadWrite.OwnedBy
Connect-MgGraph -Scopes "Application.Read.All", "Directory.Read.All"
$graph = Get-MgServicePrincipal -Filter "appId eq '00000003-0000-0000-c000-000000000000'"
Get-MgOauth2PermissionGrant -All |
    Where-Object { $_.ResourceId -eq $graph.Id -and ($_.Scope -split " ") -contains "ExternalItem.ReadWrite.OwnedBy" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other ExternalItem permissions

Check every app in your tenant → Permission explainer

Sources