Token Theft and AiTM Attacks: How to Stop MFA Bypass in Microsoft 365
Token Theft and AiTM Attacks: How to Stop MFA Bypass in Microsoft 365
November 3, 2026 ·
Multi-Factor Authentication remains essential, but modern attackers have found ways to bypass it. Through Adversary-in-the-Middle (AiTM) phishing attacks, threat actors can steal session tokens, hijack authenticated sessions, and gain access to business-critical resources without needing a user's password.
In this session, we'll break down the token theft attack lifecycle and examine how attackers move from credential phishing to business email compromise, data theft, persistence, and lateral movement. You'll learn how these attacks work, why traditional MFA alone is no longer enough, and which Microsoft 365 security controls can help detect, prevent, and contain them.
We'll explore practical defense strategies using Microsoft Defender for Office 365, Conditional Access, Identity Protection, web filtering, automated response, and continuous monitoring. You'll leave with a layered security blueprint that can help reduce token theft risk across your own organization or your customers' environments.
Key Takeaways:
- Understand how AiTM attacks bypass traditional MFA protections
- Learn the stages of the token theft kill chain
- Identify Microsoft 365 security controls that disrupt attacker activity
- Reduce the risk of business email compromise and account takeover
- Build a practical defense-in-depth strategy for modern phishing threats
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