08/10/2026
Your MFA can be phished. Most people have no idea this is possible. 🚨
A lot of business owners think that once MFA is turned on, their accounts are safe from phishing.
That’s no longer true.
There’s an attack called reverse proxy phishing, also known as Adversary-in-the-Middle (AiTM), and it defeats most traditional MFA.
Here’s how it works:
Old-school phishing sent you to a fake login page and stole your password. If you had MFA, that stolen password wasn’t enough.
AiTM is smarter.
The attacker puts a server between you and the real website. You click what looks like a normal Microsoft 365 or Google login link, but everything you type is flowing through the attacker’s infrastructure.
The page looks real because it IS real. The attacker is just relaying it to you live.
You enter your password. âś… Forwarded to the real service.
You approve the MFA prompt. âś… Forwarded to the real service.
The service logs you in and issues a session cookie that says “this user is authenticated.”
That cookie is what the attacker steals. With it, they’re in your account. No password needed. No MFA needed. You logged them in yourself.
And this isn’t some elite hacker technique. There are phishing-as-a-service operations selling this capability to anyone willing to pay.
Here’s the problem: these fake login pages are pixel-perfect copies of the real thing. Your employees can’t tell the difference. Nobody can.
That’s why we don’t leave it up to the human.
Our clients run a browser security layer that inspects login pages as they load. If someone clicks a link and lands on a fake Microsoft 365 or Google login, it alerts them on the spot, and if it’s a known attack, it blocks the page before a single keystroke goes in.
The phishing email still arrives. The click still happens. The attack still fails.
That’s the difference between hoping your people spot the fake and knowing the fake never gets a chance.
Honest question: if one of your employees clicked a link like this recently, what’s standing between them and a stolen account?
If the answer is “nothing” or “I’m not sure,” that’s exactly what our free network evaluation is for.
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Grapevine MSP Technology Services
The Valley’s Leading IT Service Provider
