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← cd ~/graph-permissions
// graph-permissions · PreAuthorizationGrant

PreAuthorizationGrant.Read.AllMicrosoft Graph permission · Medium risk

Allows the app to read preauthorization grants for service principals without a signed-in user.

Application permission

Medium risk

Read all preauthorization grants. Allows the app to read preauthorization grants for service principals without a signed-in user.

ID66ae8ecc-328f-47f6-97ca-4d9e952df081
ConsentAlways needs admin consent
RiskReads data across the tenant without a signed-in user.

Delegated permission

Low risk

Read all preauthorization grants. Allows the app to read preauthorization grants for service principals on behalf of the signed-in user.

ID9c98cbde-410c-4719-9058-166504f17863
ConsentNeeds admin consent
RiskRead access, limited to what the signed-in user can see.

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 "66ae8ecc-328f-47f6-97ca-4d9e952df081"

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 "PreAuthorizationGrant.Read.All"

Which apps already have it?

powershell6 lines
# Apps that hold PreAuthorizationGrant.Read.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 "66ae8ecc-328f-47f6-97ca-4d9e952df081" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for PreAuthorizationGrant.Read.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 "PreAuthorizationGrant.Read.All" } |
    Select-Object ClientId, ConsentType, PrincipalId

Check every app in your tenant → Permission explainer

Sources