09/10/2026
The FBI put out an advisory September 1 about an attack that does not care about your MFA.
It is called OAuth consent phishing. The attacker registers an app with Microsoft or Google, sends a link, and asks you to approve permissions. You sign in on the genuine Microsoft page. You approve. That app can now read your mail and your files.
Two details make it dangerous. MFA never comes into it, because you authenticated correctly. And a password reset does not fix it, since the token survives until someone revokes it by hand.
The good news is that the primary defense is a setting, not a training slide. Here is what we do for the clients we support.
We turn off user consent for unverified third party apps in Entra ID and route requests through admin approval. That stops it at the click.
We review authorized enterprise applications in the tenant on a schedule, so a token that should not be there gets found early.
Inky filters the message before anyone sees it, and Duo and Defender cover the login itself.
Want a second set of eyes on what is connected to your tenant? Reach out.