Assign Sensitivity Labels to Security Groups

Introduction

In a business context where Microsoft 365 is often used to protect documents, emails, or collaborative spaces such as Teams and SharePoint, a crucial aspect is sometimes overlooked: the governance of security groups. These groups play a fundamental role in managing access to critical resources within the Microsoft Entra environment and directly influence the security of applications, systems, and sensitive data.

Microsoft has recently introduced a feature, currently in Preview, allowing sensitivity labels to be assigned directly to security groups. This innovation adds an important classification layer, facilitating the management and organization of sensitive groups without modifying their permissions.

Features of Sensitivity Labels for Security Groups

Why Classify Security Groups?

With this new feature, administrators can assign predefined or custom sensitivity labels (such as Public, Internal, Confidential, or Highly Confidential) to security groups. This establishes a homogeneous classification model for identity objects and information assets.

These labels have no direct impact on permissions or group composition, but serve only to streamline governance, ensuring better visibility of critical groups and facilitating their management according to organizational policies.

Differences with Labels for Microsoft 365 Groups

Although Microsoft 365 Groups also support sensitivity labels, their objectives differ.

The key distinction lies in member evaluation: for security groups, Microsoft Entra evaluates direct and inherited members (via nested groups) to ensure consistent application of access policies according to labels.

Key Points Before Implementation

Characteristics of Sensitivity Labels

Permanent Label

Unlike Microsoft 365 Groups, sensitivity labels applied to security groups are irreversible for now. If an incorrect label is applied, the only solution is to create a new group with the correct label and transfer the members.

Label Policies

Policies associated with labels can be modified after their application. However, changes do not always have a retroactive effect. For example, a policy prohibiting guests will not automatically remove existing accounts in groups. Administrators must manage these inconsistencies manually.

Nested Groups Management

When a nested group is involved, the label of a subgroup must be as restrictive, or more restrictive, than that of the parent group. To apply a label to a parent group containing nested groups, it is necessary to:

1. Remove nested groups.
2. Assign appropriate labels individually.
3. Reorganize the hierarchy.

Administrative Exceptions

During the Preview phase, certain privileged administrator roles or applications with Microsoft Graph permissions may bypass label policies. It is advisable to document these exceptions in governance processes to ensure future compliance.

Prerequisites for Enabling the Feature

Before implementing sensitivity labels for security groups, ensure:

• You have the required Microsoft Entra or Microsoft 365 licenses.
• Sensitivity labels are created and published via Microsoft Purview.
• Synchronization between Microsoft Purview and Microsoft Entra is complete.
• The "EnableMIPLabels" parameter is enabled for the Group.Security template.

Microsoft recommends using Microsoft Graph PowerShell to configure the necessary parameters. Then apply a synchronization period before assigning labels.

Steps to Assign a Label to a Security Group

1$param = @{  
2   displayName     = "Finance Access"  
3   mailEnabled     = $false  
4   securityEnabled = $true  
5   mailNickname     = "FinanceAccess"  
6   assignedLabels   = @(@{ LabelId = "<LabelId>" })  
7}  
8New-MgBetaGroup $param

1Update-MgBetaGroup -GroupId <GroupId> -AssignedLabels @(  
2    @{ LabelId = "<LabelId>" }  
3)

Conclusion

Assigning sensitivity labels to security groups can transform identity governance in your Microsoft Entra environment. By carefully evaluating prerequisites, policy implications, and group structure, this feature can strengthen consistent and secure management of access to critical resources.