Multi-factor authentication (MFA) has been one of the most effective cybersecurity controls of the last decade. But in 2026, attackers have adapted — and one of the most common ways they bypass MFA isn’t technical at all. It’s psychological.
Imagine this: A staff member’s phone starts buzzing nonstop with login approval requests. They’re in a meeting, it’s late, or they assume IT is testing something. To stop the noise, they tap “Approve”. That single tap is all an attacker needs to enter your system.
This blog explains what MFA fatigue attacks are, how to identify them early, how to stop them and recover quickly, and whether a Managed Service Provider (MSP) can be helpful.
What is an MFA fatigue attack?
In an MFA fatigue attack, attackers bombard a user with repeated MFA approval requests at inconvenient times until one is approved. It is also known as MFA bombing or spamming. The goal is to confuse or frustrate the user so that they “wear down” (fatigue) into approving a request.
How does it work?
Step 1:
The attacker obtains the user’s password. This usually happens through phishing, data breaches, or password reuse across services.
Step 2:
The attacker attempts to log in. Because MFA is enabled, the login triggers an MFA approval request to the user’s device.
Step 3:
The prompts keep coming. Dozens of push notifications may arrive — often late at night or outside business hours, which confuses the user.
Step 4:
The user approves a request either to stop the alerts, by accident, or after receiving a fake “IT support” call or text telling them to approve it.
Step 5:
The attacker gains access. Once inside the system, attackers move fast — changing settings, accessing private or financial information, or deploying malware.
Why do MFA Fatigue Attacks Still Work in 2026
MFA fatigue attacks remain effective because they exploit human behaviour. Attackers don’t need to break MFA. They just need someone to get tired. Notification overload constantly interrupts people with alerts, messages, and approval requests. People approve requests just to stop the notifications.
Another reason why they are effective is that overly simple MFA prompts like basic “Approve / Deny” buttons are easy to mis-tap. And with more remote and hybrid work, it’s harder to quickly verify “was that you?” when teams aren’t sitting together or working the same hours.
Why MFA Fatigue Attacks Put Your Organisation at Risk
A successful MFA fatigue attack can have serious and lasting consequences:
Financial Loss
Fraud, diverting funds, and the cost of investigation, legal action and recovery are some of the most common financial losses.
According to the Australian Signals Directorate’s Annual Cyber Threat Report 2024-25, the average self-reported cost of cybercrime per report for businesses was up 50%. On average, small businesses lost $56,600, medium-sized businesses lost $97,200, and large businesses lost $202,700.
Operational Disruption
Account lockouts, system downtime, and diverted IT resources during incident response can stop your operations, which makes the financial loss worse. The average downtime following a cyberattack in 2025 is 24.6 days.
Reputational Damage
Loss of trust from customers, partners, and suppliers. This also has an impact on long-term trust. Rebuilding confidence with staff and customers takes far longer than preventing the attack.
Customer Churn
You can easily lose the trust of your customers and lose their business, especially where sensitive data or services are involved.
Legal and Compliance Consequences
Breaches may trigger reporting obligations, audits, or penalties, which add to the overall cost and stress of an attack.
A real case of MFA Fatigue Attack in Australia
In 2023, an MFA bombing scam at the University of Queensland resulted in student and staff accounts being compromised. It’s a textbook example of how MFA spamming looks in the real world and how social engineering completes the attack.
What happened
Attackers attempted repeated logins using stolen passwords. Users received continuous MFA approval prompts they did not initiate, often outside normal working hours. In some cases, attackers followed up with fake “IT support” messages asking users to approve the request.
What the University of Queensland did
The university’s Cyber Security Operations Centre (CSOC) locked down the accounts and blocked the URLs. Furthermore, they educated students and staff by telling them to:
- Never approve an MFA request that they didn’t initiate
- Report unexpected MFA prompts immediately
- Treat repeated MFA requests as a sign of compromise
Ways to Recognise an Attack Early
Early detection can mean the difference between a blocked attempt and a full incident.
What a User may Notice
An individual user, i.e., your staff members, will receive:
- Repeated MFA push notifications
- Authentication requests they didn’t start
- MFA prompts arriving outside of normal working hours (late night, early morning)
What IT Teams Can Detect
- Sign-in attempts from unfamiliar devices.
- Repeated MFA approval requests from IPs or regions with no prior relationship to the user. This kind of “impossible travel” is a sign of a scam.
- MFA prompts triggered without corresponding user login activity or outside of business hours.
Should You Still Use MFA?
Yes, MFA remains crucial to your cybersecurity. But in 2026, basic MFA is not enough, it needs to be strengthened. Here are two models of MFA that can fail easily:
- Traditional push-based MFA (“Tap to Approve/Decline”) relies on human judgement and allows unlimited prompts. That’s the psychology attackers exploit.
- One-time passcodes (OTP) are stronger, but still vulnerable to phishing pages that can allow attackers to get in.
How to Protect Your Business from MFA Fatigue Attacks
Quick Wins
These are tips you can implement as early as this week.
Strengthen your MFA
- Add context to MFA prompts. Show location, device, and application details so users can tell when “this isn’t me”. If your MFA doesn’t show context, it’s far easier to trick users.
- Restrict access to your apps so they only work from managed or known devices.
- Limit how many MFA prompts a user can receive in a short period. MFA fatigue attacks rely on volume. Rate limits on the MFA can break the attack.
Simple User Education
Tell your team: “If you didn’t start the login, don’t approve it — report it”. Reinforce good password hygiene and regular MFA reviews.
Stronger Authentication Options
Implement stronger protection methods, which may need some time to implement.
Least-Privilege Access
Reduce the number of accounts accessible to everyone, especially email and finance systems that contain sensitive data. Reducing the number of access points reduces your attack surface.
Time-Based OTPs
Use number matching that requires intent (for example, entering a number shown on screen). Google Authenticator is a great example of this. The number on the screen changes every few seconds, giving users a small window of time to log in. Authenticator app codes are safer than blind push approvals in many environments.
Risk-Based Authentication
Risk-based MFA applies stronger controls when the risk is higher. Each login attempt gets a score. If the system detects unusual behaviour, such as a new IP address, location, or device, it assigns a higher risk score to the login attempt. For high-risk logins, additional factors are mandated, such as a security question or a code.
Upgraded Protection
Fast IDentity Online 2 (FIDO2) is a standard for password-less and phishing-resistant authentication. For sensitive and high-risk industries, such as banking or finance, or administrator- or executive-level access, use biometrics (fingerprint or face) for login, along with a password. This adds an extra layer of security and reduces reliance on passwords entirely.
Detection and Response Tools
Security Information and Event Management (SIEM) is a cybersecurity solution that collects and analyses security data — such as sign-ins, alerts, and logs — in real time. Using this data, it can detect threats and anomalies and block them before an attack. These are best for large organisations or remote teams that need visibility into the entire network’s security. It also saves time as the IT team doesn’t need to manually search for anomalies.
How to Recover from an MFA Fatigue Attack
Contain the Threat
As soon as an attack is detected (within the first hour), you need to revoke the active sessions and force sign-out. Immediately reset the affected user’s password.
Investigate
Once the threat has been contained, review sign-in logs during the attack window. Block the IP address that was used for login. Look for any changes in the account, such as the addition of new MFA methods, new trusted devices or any new applications. Check rules for email forwarding and access. Check the application for any missing information as well, and start your data recovery process in case you’ve lost data.
Follow-Through
Communicate clearly with staff about what happened and educate them on how to respond to such threats in the future. If you haven’t done it already, strengthen your MFA.
Should I Use an MSP?
MFA fatigue attacks don’t succeed because technology fails — they succeed because attackers pressure people. With the right controls, smarter MFA choices, and a clear response protocol, you can retain the protection MFA offers. For many organisations, defending against MFA bombing or other cyberattacks requires time, expertise, and tools that internal teams cannot maintain on their own. This is where an MSP can make a meaningful difference. A Managed Service Provider (MSP) is a third-party company that proactively manages, monitors, and supports your IT infrastructure, security, and day-to-day technology needs.
For business owners, managed cybersecurity services mean reducing the risk of breaches and fraud before they happen, rather than dealing with costly cleanup after an incident. Just as importantly, you get confidence that your systems align with modern security and compliance standards, which adds a layer of trust for your customers, partners, and regulators.
For IT teams, working with an MSP for cybersecurity has an operational impact. An MSP provides continuous monitoring that internal teams may not have the capacity for. When incidents do occur, an MSP’s experience helps them act efficiently, saving time during high-pressure situations and reducing the risk of mistakes.
Why Work With MSP Blueshift
MSP Blueshift is a leading managed service provider supporting Australian businesses with a strong focus on cybersecurity. For us, security is not an add-on. It’s built into everything we do. Our focus is on practical, effective controls that reduce real-world risk, not just compliance on paper.
With an ISO 27001 certification, MSP Blueshift strengthens an organisation’s defences while meeting recognised security standards. We have achieved the CyberCert SMB1001 – Gold Level 3, a mark of excellence in cybersecurity for Australian small to mid-sized businesses. This certification makes us an ideal partner if your organisation deals with sensitive data, needs to meet compliance requirements, or operates in regulated industries.
Want help strengthening MFA, detecting attacks earlier, or reviewing cybersecurity across your entire IT system? Talk to MSP Blueshift about building a safer, more resilient IT ecosystem for 2026 and beyond.
