What should be used instead of the Azure Reader and Data Access Role for least privilege?

What to use instead of the broad Azure Reader and Data Access Role

Use the narrowest Azure role that matches the actual job: management-plane read access, data-plane read access, or both. The Reader and data access role is broad because it exposes more than many tasks require, so least privilege usually means separating visibility from data access and assigning only the minimum role needed for the specific operation.

If the task is only to inspect configuration, inventory, or status, grant a role that reads resources but does not grant data-plane access. If the task is to read data inside a service, grant the narrow data-reader role for that service instead of a combined role. The practical test is whether the principal truly needs to see resource metadata, actual data contents, or both.

Azure role choice also depends on scope. A role at subscription or resource-group scope can be much broader than the same permission at a single resource scope, so least privilege is not just about the role name, but also about where it is assigned. In practice, a narrowly scoped built-in role is usually preferable to a broad combined role that is applied at a high scope.

Risk and Threat Considerations

Broad read roles create unnecessary exposure because they collapse two different trust decisions into one assignment. That can reveal operational details, secrets-adjacent metadata, or sensitive data to a principal that only needed one of those views, and it can make it harder to detect when access has become excessive over time.

Failure mechanism: A combined role grants management-plane visibility plus data-plane access, so any compromise, misassignment, or delegated use of that principal inherits a wider blast radius than the task requires.

Impact: Attackers or internal users with the role can inspect more resources and data than intended, which increases exposure, weakens segregation of duties, and complicates access review and containment.

How to choose the right Azure permission shape

The decision starts with the resource type and the action. For administrative or inventory work, use a read-only management role that covers the Azure control plane. For application or storage data access, use the service-specific data-reader role, not a generic combined role. Where a task spans both planes, separate the permissions deliberately so you can review and revoke them independently.

Scope matters as much as role selection. A narrow role assigned at a narrow scope gives you much better blast-radius control than the same role assigned where it inherits across many subscriptions, resource groups, or resources. If the role is being used as a convenience shortcut for multiple teams, it is usually already too broad for least privilege.

Practitioner Guidance

What to verify: Confirm whether the principal needs only inventory-style visibility, only data access, or both. If you cannot point to a concrete read path or service operation, the assignment is probably broader than necessary.

Decision rule: If the principal does not need to read data contents, do not grant a data-plane role. If it does not need to inspect resource state, do not grant management-plane read access. Split those permissions instead of inheriting both by default.

What good looks like: A reviewer can explain exactly why each role exists, what plane it covers, and why its scope is limited to the smallest practical boundary. That makes later access review and removal straightforward instead of ambiguous.

Practitioner takeaway: Least privilege in Azure is usually a combination of role specificity and scope control, not simply replacing one broad role with another built-in read role.

Related resources from NHI Mgmt Group

• Guide: Azure RBAC and Service Principals Guide
• What should be used instead of the Azure Key Vault Data Access Administrator Role for least privilege?
• What should be used instead of the Azure Storage Blob Data Reader role for least privilege?
• What should be used instead of the Azure Storage Blob Data Contributor role for least privilege?
• What should be used instead of the Azure AI Administrator Role for least privilege?