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Your MFA may not be as strong as you think.

Traditional multi-factor authentication is now bypassed in real time. Phishing-resistant MFA closes the gap — and you probably already own the license.

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Implement MFA everywhere in M365

MFA was the answer. Then attackers adapted.

Standard MFA — push approvals, number matching, authenticator codes, SMS — stopped the majority of account takeovers for years. It doesn’t anymore. Attackers now relay a legitimate login in real time and steal the session token the moment MFA succeeds. Your employees do everything right, and the attacker still gets in.

Corsica clients with phishing-resistant MFA in place typically see fewer than five business email compromise incidents per year.

How the attack works (5 steps)

  1. The lure — A convincing email — often from a compromised partner — links to a legitimate file-sharing page. Filters see nothing wrong.
  2. The fake login — The user lands on a pixel-perfect copy of the Microsoft sign-in page. The URL is off; nobody checks.
  3. The relay — The attacker proxies every keystroke — username, password, MFA code — to the real Microsoft in real time.
  4. The catch — Microsoft issues a session token. The attacker captures it and is now fully logged in.
  5. The strike — They watch quietly for a payment in flight, then redirect the funds. Wired money is rarely recovered.

Traditional MFA never verifies who is asking to authenticate. Phishing-resistant MFA does.

How does phishing-resistant MFA work?
How do we deploy phishing-resistant MFA?

Origin-bound authentication. The attack simply fails.

Phishing-resistant MFA is built on the FIDO2 standard. The credential is cryptographically bound to the real site, so a fake page can never obtain a valid token — the math doesn’t work in the attacker’s favor. Three methods cover virtually every environment:

  • Passkeys — Recommended for most users. Works across Windows, Mac, iOS, and Android with a tap or biometric.
  • Windows Hello for Business — Built into Windows. Face, fingerprint, or PIN — no phone needed.
  • Certificate-based authentication — For organizations with specific compliance architecture needs (a small minority).

Most of the cost is our labor, not new licensing.

Enforcing phishing-resistant MFA requires Microsoft Entra ID Plan 1 — already included with Microsoft 365 Business Premium and E3. The policy configuration takes under an hour; the real work is scoping exceptions, phasing the rollout, and supporting enrollment. We handle all of it.

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What is account takeover really costing you?

Adjust a few inputs to see your estimated annual BEC exposure — and how much phishing-resistant MFA removes.

See what account takeover could cost your business.

Phishing Resistant MFA Insights

Frequently Asked Questions:

What if we already have MFA / Duo?

If it isn’t FIDO2-based, it doesn’t stop real-time proxy attacks. We’ll assess your exact configuration and recommend the most cost-effective path.

Isn’t number matching phishing-resistant?

No. It reduces push spam but never verifies who is requesting access. A proxy attack defeats it.

Will this disrupt our users?

For most people it’s simpler than today. We phase the rollout and support the 10–20% who need a hand.

Are we too small to be a target?

Attacks are automated and opportunistic. Smaller organizations are hit precisely because defenses are often lighter.

Contact Us

Pressure-test your MFA with your vCIO.

Book a short assessment. We’ll review your current posture, map the gaps, and scope a phishing-resistant rollout for your specific environment — no obligation.

Ready to talk to an expert?

We’ll respond within 1 business day, or you can grab time on our calendar.