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

CustomDetection.Read.AllMicrosoft Graph permission · Medium risk

Allows the app to read custom detection rules without a signed-in user.

Application permission

Medium risk

Read all custom detection rules. Allows the app to read custom detection rules without a signed-in user.

ID673a007a-9e0f-4c97-b066-3c0164486909
ConsentAlways needs admin consent
RiskReads data across the tenant without a signed-in user.

Delegated permission

Low risk

Read custom detection rules. Allows the app to read custom detection rules on behalf of the signed-in user.

IDb13ff42e-f321-4d7d-a462-141c46a1b832
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 "673a007a-9e0f-4c97-b066-3c0164486909"

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 "CustomDetection.Read.All"

Which apps already have it?

powershell6 lines
# Apps that hold CustomDetection.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 "673a007a-9e0f-4c97-b066-3c0164486909" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for CustomDetection.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 "CustomDetection.Read.All" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other CustomDetection permissions

Check every app in your tenant → Permission explainer

Sources