azureblog.co.uk
← cd ~/graph-permissions
// graph-permissions · Policy

Policy.ReadWrite.CrossTenantAccessMicrosoft Graph permission · Medium risk

Allows the app to read and write your organization's cross-tenant access policies and configuration for automatic user consent settings to suppress consent prompts for users of the other tenant on behalf of the signed-in user.

Application permission

Medium risk

Read and write your organization's cross tenant access policies. Allows the app to read and write your organization's cross-tenant access policies and configuration for automatic user consent settings to suppress consent prompts for users of the other tenant on behalf of the signed-in user.

ID338163d7-f101-4c92-94ba-ca46fe52447c
ConsentAlways needs admin consent
RiskCan make changes. Check the scope is as narrow as possible.

Delegated permission

Medium risk

Read and write your organization's cross tenant access policies. Allows the app to read and write your organization's cross-tenant access policies and configuration for automatic user consent settings to suppress consent prompts for users of the other tenant on behalf of the signed-in user.

ID014b43d0-6ed4-4fc6-84dc-4b6f7bae7d85
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 "338163d7-f101-4c92-94ba-ca46fe52447c"

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 "Policy.ReadWrite.CrossTenantAccess"

Which apps already have it?

powershell6 lines
# Apps that hold Policy.ReadWrite.CrossTenantAccess 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 "338163d7-f101-4c92-94ba-ca46fe52447c" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for Policy.ReadWrite.CrossTenantAccess
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 "Policy.ReadWrite.CrossTenantAccess" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other Policy permissions

Check every app in your tenant → Permission explainer

Sources