Is Your Microsoft 365 Tenant Configured Correctly? Security Audit Questions

The Illusion of Out-of-the-Box Cloud Security

Speaking with several clients over the last few months, I noticed that when they migrate their operations to Microsoft 365, they almost always assume the platform is inherently secure. There is this comfortable belief that simply because they are hosted on Microsoft's global servers, their emails, files, and communications are automatically shielded from cyberattacks. This perception is a dangerous illusion. The default settings of a Microsoft 365 tenant are configured out-of-the-box to prioritize user-friendliness and immediate connectivity, not maximum security.

In 2026, BEC (Business Email Compromise) attacks and identity spoofing have reached unprecedented levels of sophistication. Attackers no longer just look to crash systems; they silently infiltrate corporate mailboxes, monitor conversations for weeks, and alter IBANs on legitimate invoices moments before they are paid. Cloud security does not depend on what Microsoft does, but rather on how your access controls have been configured.

4 Critical Audit Questions You Must Ask

To assess your business's true level of exposure, confront your IT management or current provider with these four technical audit questions:

• 1. Is MFA conditionally active for 100% of users, or is the company suffering from "MFA Fatigue"? Enabling Multi-Factor Authentication only for administrators is an invitation to disaster. In 2026, hackers exploit MFA fatigue, bombarding regular employees with login notifications until one eventually gives in by mistake. MFA must be universal and tied to Conditional Access policies (e.g., blocking automatic access attempts from outside your country of operation or from unregistered devices).
• 2. Are SPF, DKIM, and DMARC protocols properly validated and set to reject mode on your domain? If these three cryptographic signatures are not strictly configured in your DNS server, any cybercriminal can forge your exact domain (@yourcompany.com) to send spoofed emails to clients and suppliers, destroying your brand's reputation in minutes.
• 3. Are there hidden auto-forwarding rules active in any mailboxes? This is the classic signature of a BEC attack. When an attacker gains temporary access to an account, they do not change the password to avoid raising alarms; instead, they simply create a hidden rule that forwards a copy of every email containing words like "invoice", "payment", or "bank" to an external address. Are you actively monitoring these rules?
• 4. Is file sharing in SharePoint and Teams open to anonymous public links? Allowing employees to generate access links to confidential documents using the "Anyone with the link" option means strategic data, contracts, or personal data protected by GDPR can be indexed or accessed by third parties without any identity verification.

Working with Multisnet: Defensive Engineering and Tenant Hardening

At Multisnet, we do not treat cybersecurity as a theoretical checklist. We approach your infrastructure's protection through advanced defensive engineering and the strict application of the Zero Trust principle.

• Total Tenant Hardening: We close the native vulnerabilities of your Microsoft 365 environment. We disable legacy and obsolete authentication protocols that hackers use to bypass MFA, and we restructure your entire user permission tree.
• Active DLP (Data Loss Prevention) Policies: We implement intelligent rules that automatically detect when an employee attempts to send sensitive data (such as credit card numbers, national ID details, or attachments classified as confidential) outside the organization, blocking the share and alerting the security team in real time.
• Continuous Configuration Audits: Attackers evolve, and Microsoft updates its platforms weekly. Our team ensures your security policies remain dynamic, continuously auditing the environment to counter the latest cyber threats of 2026.

Do Not Leave Your Invoicing Security to Chance

Assuming your cloud is secure by default is a financial risk. In the current landscape, mitigating vulnerabilities must be a priority.

Are you absolutely certain that your corporate email is not being monitored by a third party at this very moment?

Find out the truth before it is too late. Contact the Multisnet team today to request an Initial Security Audit for your Microsoft 365 and ensure your company's assets and invoicing remain fully shielded.