Is Your Microsoft 365 Environment Actually Secure? Here’s What Most Get Wrong

You’re already paying for Microsoft 365 security but your environment may be less secure than you think. 

In many organizations, critical controls like Conditional Access, Defender policies, and data protection settings sit idle, misconfigured, or slowly drift out of alignment as the business grows. 

Too many M365 tenants fall into this trap, believing that once the licenses are purchased and the dashboards light up, the environment is automatically secure. In reality, security in M365 isn’t something you buy. It’s something you operate.  

Why “secure by default” isn’t enough in Microsoft 365

Microsoft’s secure by default ensures that systems, applications, and services are configured with strong security settings from the outset.  

Protections like malware filtering, phishing detection, and some automatic safeguards are enabled out of the box. However, “secure by default” is often misunderstood as meaning secure enough for your organization when it’s a starting point and not a final state. 

Microsoft 365 gives you the tools to secure your environment without assuming your specific requirements. It’s your responsibility to configure them.  

The 6 Most Overlooked Microsoft 365 Security Gaps 

This is where the gap between the tools you’ve bought and the controls you’ve never fully implemented becomes obvious.  

In 70% of security assessments we’ve conducted, these high impact gaps show up repeatedly. We’ll explain what they do and what happens if you don’t configure them properly: 

1. 1. MFA isn’t consistently enforced especially for admin access. 
      What it does: This control adds a second layer of verification beyond passwords, drastically reducing the effectiveness of stolen credentials.

      Admin portals remain one of the most targeted entry points, yet in many cases, strong authentication is either missing or loosely applied.  

      What happens if you don’t: A single compromised password can give an attacker full access to a user account. If that account has admin privileges, the entire tenant is at risk. 

2. 2. Too many users have elevated privileges. 
      What it does: Global admin roles and other high-level permissions provide full control over the tenant (users, data, security settings and configurations).

      When properly limited, they reduce the number of high-value targets attackers can exploit. 

      What happens if you don’t: Such roles are often over-assigned, left with inactive or unnecessary accounts or shared by IT teams, significantly increasing the attack surface. If even one of those accounts is compromised, an attacker can escalate quickly, disable protections, create backdoors, and take full control of the environment. 

3. 3. Legacy authentication is still enabled. 
      What it does: Modern authentication enforces security controls like MFA, Conditional Access, and risk-based policies.

      What happens if you don’t: Legacy authentication, however, doesn’t support modern security controls, meaning attackers can bypass MFA and Conditional Access entirely. Even in a well-secured environment, a single exposed account using legacy authentication can become a direct entry point, making it one of the most common and overlooked attack paths. 

4. 4. Conditional Access isn’t being used to its full potential. 
      What it does: This allows you to control who can access what, under which conditions. This includes enforcing MFA, blocking risky sign-ins, requiring compliant devices, and limiting session behavior.

      What happens if you don’t: Without properly configured policies, access decisions are left too open. Risky sign-ins go unchallenged, unmanaged devices gain entry, and sensitive data can be accessed from anywhere. Everything else becomes easier to bypass.

5. 5. Risk signals are detected but not acted on. 
      What it does: Microsoft Entra ID Identity Protection continuously analyses sign-in behavior and flags anomalies. When paired with automated response policies, these signals can trigger actions like enforcing MFA, blocking access, or forcing password resets in real time.

      What happens if you don’t: If alerts are generated but no action is taken, risky users can continue accessing the environment unchecked. Detection without response creates a scenario where threats are visible, but nothing is stopping them.

6. 6. External access and email protections are loosely configured. 
      What it does: These controls and policies help regulate how data is shared outside the organization and defend against impersonation, spoofing, and phishing attacks. Proper configuration limits exposure while ensuring only trusted interactions are allowed.

      What happens if you don’t: Overly permissive guest access can lead to unintended data exposure, while weak email protections make it easier for attackers to impersonate trusted contacts or domains. This leads to a higher likelihood of phishing success, data leakage, and unauthorized access, which won’t trigger the obvious alarms. 

These are the most common gaps we’ve come across but they’re not the only ones. Areas like audit logging, DLP, device management, and mailbox controls also introduce a whole additional layer of risk when left unconfigured. 

Should You Be Managing This In-House? 

Many SMBs reach a point where managing Microsoft 365 security internally becomes difficult to sustain. 

The platform changes frequently, new controls are introduced, and existing features are updated or renamed. Keeping up with those changes takes time, and security settings that were once correct can quietly drift out of alignment. 

Maintaining effective security requires active supervision. Policies need to be reviewed, alerts need to be acted on, and settings need to reflect how the business is evolving. Without that, it becomes harder to tell what is properly secured, what has been overlooked, and whether the environment is keeping up with current threats. 

Many organizations opt to bring in external expertise to validate their setup. Others run periodic assessments or work with a managed service provider like Molaprise to keep their environment continuously monitored and maintained. 

Not sure what’s protecting your Microsoft 365 environment? 

We can review your setup and highlight any gaps, misconfigurations, or unused controls that may be leaving it exposed at no cost.