What is the security risk of granting AppRoleAssignments.ReadWrite.All to an automation app that creates groups inside Administrative Units and adding that groups to Enterprise application?

Question

What is the security risk of granting AppRoleAssignments.ReadWrite.All to an automation app that creates groups inside Administrative Units and adding that groups to Enterprise application?

SrVish 20

I have an internal automation application that performs the following tasks in Entra ID:

Creates Azure AD groups inside specific Administrative Units

Makes selected users PIM-eligible for those newly created groups

Assigns the newly created groups to an Enterprise Application (used as an external IdP for AWS)

To enable these operations, the app registration currently has the AppRoleAssignments.ReadWrite.All Graph API permission.

I understand this is a very high-privilege permission, and I want to validate whether my design has unnecessary security exposure.

My questions are:

What is the worst-case impact if AppRoleAssignments.ReadWrite.All is compromised or misused?

Is there a least-privilege alternative to using AppRoleAssignments.ReadWrite.All for assigning newly created groups to an Enterprise App?

Are there recommended best practices for securing automation apps that manage PIM-eligible groups and application assignments?

Any guidance or official Microsoft reference would be greatly appreciated.

VEMULA SRISAI 13,985 Reputation points Microsoft External Staff Moderator

2025-12-06T08:49:19.6066667+00:00
Hello SrVish,

Thank you for raising this important question. Here’s the guidance:

Risk of AppRoleAssignments.ReadWrite.All This permission is highly privileged because it allows an app to manage role assignments for any enterprise application in the tenant. If compromised, an attacker could:

Assign themselves or other principals to sensitive app roles.

Escalate privileges and bypass Conditional Access or PIM controls.

Create persistent backdoors and disrupt services.

Least-Privilege Alternative Instead of granting AppRoleAssignments.ReadWrite.All, consider:
- Custom Directory Roles scoped to a single enterprise app using `microsoft.directory/servicePrincipals/appRoleAssignedTo/update`. - Use `Application.ReadWrite.OwnedBy` for app-specific management combined with `Group.ReadWrite.All` for group operations. - Implement approval workflows for assignments rather than broad permissions.

Best Practices

Apply Principle of Least Privilege: grant only what’s necessary.

Use Privileged Identity Management (PIM) for time-bound, MFA-protected activation of roles.

Enforce Conditional Access on automation app service principals.

Monitor Graph API calls and audit logs for assignment changes.

Store credentials securely in Azure Key Vault and prefer managed identities.

Consider Entitlement Management for controlled access instead of static group assignments.

References:

Microsoft Graph Permissions

Custom Roles for Enterprise Apps

PIM Deployment Plan

Best Practices for Identity Governance

Your answer

VEMULA SRISAI 13,985 Reputation points Microsoft External Staff Moderator

2025-12-06T08:49:19.6066667+00:00

Hello SrVish,

Thank you for raising this important question. Here’s the guidance:

Risk of AppRoleAssignments.ReadWrite.All This permission is highly privileged because it allows an app to manage role assignments for any enterprise application in the tenant. If compromised, an attacker could:

Assign themselves or other principals to sensitive app roles.

Escalate privileges and bypass Conditional Access or PIM controls.

Create persistent backdoors and disrupt services.

Least-Privilege Alternative Instead of granting AppRoleAssignments.ReadWrite.All, consider:
- Custom Directory Roles scoped to a single enterprise app using `microsoft.directory/servicePrincipals/appRoleAssignedTo/update`. - Use `Application.ReadWrite.OwnedBy` for app-specific management combined with `Group.ReadWrite.All` for group operations. - Implement approval workflows for assignments rather than broad permissions.

Best Practices

Apply Principle of Least Privilege: grant only what’s necessary.

Use Privileged Identity Management (PIM) for time-bound, MFA-protected activation of roles.

Enforce Conditional Access on automation app service principals.

Monitor Graph API calls and audit logs for assignment changes.

Store credentials securely in Azure Key Vault and prefer managed identities.

Consider Entitlement Management for controlled access instead of static group assignments.

References:

Microsoft Graph Permissions

Custom Roles for Enterprise Apps

PIM Deployment Plan

Best Practices for Identity Governance