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

TeamsTab.ReadWrite.AllMicrosoft Graph permission · High risk

Read and write tabs in any team in Microsoft Teams, without a signed-in user. This does not give access to the content inside the tabs.

Application permission

High risk

Read and write tabs in Microsoft Teams.. Read and write tabs in any team in Microsoft Teams, without a signed-in user. This does not give access to the content inside the tabs.

IDa96d855f-016b-47d7-b51c-1218a98d791c
ConsentAlways needs admin consent
RiskCan change data across the whole tenant.

Delegated permission

High risk

Read and write tabs in Microsoft Teams.. Read and write tabs in any team in Microsoft Teams, on behalf of the signed-in user. This does not give access to the content inside the tabs.

IDb98bfd41-87c6-45cc-b104-e2de4f0dafb9
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 "a96d855f-016b-47d7-b51c-1218a98d791c"

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 "TeamsTab.ReadWrite.All"

Which apps already have it?

powershell6 lines
# Apps that hold TeamsTab.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 "a96d855f-016b-47d7-b51c-1218a98d791c" |
    Select-Object PrincipalDisplayName, PrincipalId, CreatedDateTime
powershell6 lines
# Apps with delegated consent for TeamsTab.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 "TeamsTab.ReadWrite.All" } |
    Select-Object ClientId, ConsentType, PrincipalId

Other TeamsTab permissions

Check every app in your tenant → Permission explainer

Sources