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

CustomObject.ReadWrite.AllMicrosoft Graph permission · High risk

Allows the app to create, read, update, and retire tenant-defined custom objects without a signed-in user.

Application permission

High risk

Read and write all custom objects. Allows the app to create, read, update, and retire tenant-defined custom objects without a signed-in user.

ID2ebdaf81-319a-4058-9cb1-7c2c20cda877
ConsentAlways needs admin consent
RiskCan change data across the whole tenant.

Delegated permission

High risk

Read and write all custom objects. Allows the app to create, read, update, and retire tenant-defined custom objects on behalf of the signed-in user.

IDe5285887-5e95-4670-87a3-cb02d141e70c
ConsentNeeds admin consent
RiskCan change data across the whole tenant.

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 "2ebdaf81-319a-4058-9cb1-7c2c20cda877"

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 "CustomObject.ReadWrite.All"

Which apps already have it?

powershell6 lines
# Apps that hold CustomObject.ReadWrite.All 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 "2ebdaf81-319a-4058-9cb1-7c2c20cda877" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for CustomObject.ReadWrite.All
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 "CustomObject.ReadWrite.All" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other CustomObject permissions

Check every app in your tenant → Permission explainer

Sources