Controlling Admin Access: Simple Ways to Reduce Risk.

When reviewing a client’s systems, one of the first things we examine is who actually has administrative privileges. In most cases, the list is much longer than it should be. Everyday user accounts often have full admin access in Active Directory, Microsoft 365, or other cloud platforms. It may seem convenient at first, but this setup creates unnecessary risk. It leaves the environment vulnerable not only to attackers looking to cause harm, but also to accidental misconfigurations or data loss by well-intentioned staff.

The solution lies in a straightforward but powerful concept: the principle of least privilege.

The Rule of Least Privilege

The principle of least privilege (often shortened to PoLP) means giving users only the access they need to perform their duties and nothing more. In practical terms, this means no one should be using an administrative account for routine tasks like checking email, browsing the web, or opening documents.

Where administrative work is required, users should operate with two accounts: a standard account for their day-to-day use, and a dedicated admin account that’s used only when elevated rights are necessary. This simple separation significantly reduces exposure. If a user’s everyday account is compromised, the attacker doesn’t automatically inherit domain-wide control or unrestricted access to cloud resources.

Why Excessive Privileges Are a Problem

Having too many users with high-level permissions is one of the most common issues uncovered during an IT security audit. Excessive privileges magnify every kind of risk:

A single wrong click can disable accounts, delete mailboxes, or expose sensitive data. Malware and phishing campaigns become far more dangerous when admin credentials are involved, allowing attackers to move laterally through systems with little resistance. And when multiple people share similar privileges without separation of duties, accountability becomes almost impossible. No one can be certain who made which change.

What to Review Regularly

We recommend that every business periodically review its privileged accounts to ensure access remains appropriate. Start by examining Domain Admins, Enterprise Admins, and any local administrator groups, and remove anyone who doesn’t absolutely need elevated rights.

In Microsoft 365, check roles such as Global Admin, Exchange Admin, and SharePoint Admin. These roles should be limited to a small number of trusted staff. Identify and disable dormant or unused accounts, especially those belonging to former employees.

Service accounts also deserve attention. They should be documented, restricted to the functions they actually perform, and configured to prevent interactive logons.

Finally, ensure that multi-factor authentication (MFA) is enforced on every account. It’s one of the simplest and most effective defences against credential theft.

Best Practice Recommendations

Beyond access reviews, several ongoing practices help maintain a secure and compliant environment.
Idealy and where possible, administrators should use dedicated workstations that are clean, hardened systems used exclusively for management tasks. Privileged passwords should be unique, complex, and never reused. Implementing role-based access control (RBAC) ensures permissions are granted to groups rather than individual users, making access easier to manage and audit.

If you’re using Microsoft Entra (Azure AD), consider Just-In-Time (JIT) access via Privileged Identity Management (PIM). This allows users to temporarily elevate their rights when needed, automatically removing access once the task is complete. Centralised logging of admin actions should also be enabled, providing visibility into who performed what action and when.

Small Changes, Big Impact

There are a few simple steps every organisation can take right now. Removing local admin rights from everyday users dramatically reduces the chance of malware spreading unchecked. Renaming or disabling default administrator accounts makes it harder for attackers to target known usernames. Setting alerts for new privileged role assignments helps catch unwanted changes early, and scheduling quarterly access reviews keeps privileges in check.

Even modest adjustments like these can have a significant effect on reducing risk.

Final Thoughts

Controlling administrative access isn’t about locking everything down, it’s about maintaining order, protecting data, and preventing human error from turning into a major incident. Applying the principle of least privilege creates structure and accountability while minimising damage if something does go wrong.

For any business using Microsoft 365 or Active Directory, taking the time to review who holds the keys to your systems is one of the simplest and most impactful security improvements you can make.