Passkey Phishing Attacks: Why Microsoft 365 Security Can't Stop at Sign-In
Barracuda Networks, Thursday, September 24th, 2026
Barracuda warns that Microsoft 365 attackers persist quietly after passkey phishing, requiring post-login detection.
Barracuda examines passkey phishing attacks in which attackers impersonate IT support to gain access to Microsoft 365 accounts. It notes that the real danger comes after the initial compromise, as attackers quietly establish persistence through added authentication methods and map the organization to find valuable targets.
Because everyday Microsoft 365 activity like email access and file searches can look normal individually, the post argues security teams need behavioral analysis and cross-event correlation to catch these patterns.
It stresses that prevention alone is not enough without account takeover detection and post-sign-in visibility.