When MFA Can Be Tricked: Understanding MFA Fatigue Attack and Why Organizations Need More Than Just MFA
Many organizations believe that Multi-Factor Authentication (MFA) is the final barrier protecting user accounts. Once MFA is enabled, they assume the risk of being hacked is greatly reduced.
In reality, today’s cyber threats have evolved far beyond that. Attackers are no longer trying to “break MFA” directly. Instead, they trick users into approving authentication themselves or steal sessions after the user has already authenticated successfully.
That is why many organizations are now adopting Identity Protection, Privileged Access Management (PAM), and the Zero Trust model to strengthen their defenses.
MFA Is Not Broken — Users Are Being Tricked
MFA remains an important security standard and should always be enabled.
However, modern attackers often target user behavior rather than attempting to bypass MFA itself.
Common techniques include the following:
- MFA Fatigue Attack (Push Notification Bombing)
The attacker already has the victim’s username and password, then repeatedly attempts to log in. This causes the user to receive a flood of MFA push notifications asking for approval.
When these alerts keep appearing, the user may become annoyed, confused, or assume the system is malfunctioning, and may accidentally press Approve.
Once the request is approved, the attacker can immediately access the account.
This type of attack is known as MFA Fatigue Attack or Push Bombing.
- Session Cookie Theft
Even after a user successfully passes MFA, the system creates a Session Cookie to maintain authentication during the session.
If an attacker is able to steal that Session Cookie — whether through malware or a browser-based attack — they may be able to access the account without needing to go through MFA again.
In other words:
- No password is needed
- No MFA is needed
- The attacker can simply reuse the victim’s session
- Adversary-in-the-Middle (AiTM)
AiTM is an attack that uses a fake website designed to look exactly like the organization’s login page.
When the user enters their username, password, and completes MFA, all of that information is passed through the attacker before being forwarded to the real website.
The result is:
- The user logs in normally
- The attacker also receives a valid session token
This allows the attacker to access the victim’s account even though MFA was used.
How to Reduce the Risk of MFA-Tricking Attacks
Simply enabling MFA may not be enough. Organizations should strengthen their Identity Security controls with the following measures:
Use Phishing-Resistant MFA
Examples include Security Keys or Passkeys, which help reduce the risk of AiTM and phishing attacks.
Assess Login Risk
The system should be able to analyze factors such as:
- Login location
- Device used
- Behavioral anomalies
- Impossible travel
- Anonymous IPs or VPN usage
If risk is detected, the system should require additional verification or block access.
Restrict Privileged Accounts with PAM
Administrator accounts and other high-privilege accounts should be controlled with Privileged Access Management (PAM) to limit permissions, record activity, and reduce the chance that critical accounts are abused in an attack.
Adopt the Zero Trust Model
Zero Trust follows the principle: Never Trust, Always Verify
Every access request must be verified, whether it comes from inside or outside the organization. Access should never be trusted simply because the user has already passed MFA.
MFA Is Still Necessary, But It Must Be Combined with Identity Security
MFA remains a fundamental security control that every organization should use, but it should not be viewed as a complete defense against attacks.
Today, attackers are focusing more on tricking users, stealing sessions, and attacking identities rather than trying to break into systems directly.
Therefore, effective protection should combine multiple layers, including:
- Multi-Factor Authentication (MFA)
- Identity Protection
- Privileged Access Management (PAM)
- Continuous Authentication
- Zero Trust Architecture
When these work together, organizations can significantly reduce the risk of Identity-Based Attacks and better defend against today’s increasingly sophisticated cyber threats.
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