Cybersecurity threats continue to evolve, but many successful attacks still rely on one simple tactic: stolen passwords. Whether through phishing emails, data breaches, or credential leaks, cybercriminals are constantly looking for ways to gain access to business accounts.

Fortunately, one of the most effective defenses is also one of the simplest to implement: Multi-Factor Authentication (MFA).

The Numbers Speak for Themselves

A recent Microsoft study examined the effectiveness of MFA in protecting commercial accounts from unauthorized access. Researchers analyzed a large population of Microsoft Azure Active Directory users who exhibited suspicious account activity, including users whose credentials had already been leaked.

The results were remarkable:

• More than 99.99% of MFA-enabled accounts remained secure during the study period.

• MFA reduced the risk of account compromise by 99.22% across all users.

• Even when passwords had been exposed through credential leaks, MFA reduced the risk of compromise by 98.56%.

In other words, even if a cybercriminal obtains a user's password, MFA creates an additional barrier that prevents unauthorized access in nearly every case.

Why Passwords Alone Are No Longer Enough

For years, organizations relied on strong passwords as their primary line of defense. While strong passwords remain important, they are no longer sufficient on their own.

Employees often reuse passwords across multiple websites, making credential leaks particularly dangerous. Once a password appears in a data breach, attackers frequently use automated tools to test those credentials against business systems.

Without MFA, a stolen password may be all an attacker needs.

With MFA enabled, however, attackers must also provide a second form of verification—such as an approval through an authentication app, a security key, or a one-time code. This additional step dramatically reduces the likelihood of unauthorized access.

Not All MFA Methods Are Equal

The Microsoft study also compared different MFA methods and found that dedicated authentication applications, such as Microsoft Authenticator, provide stronger protection than SMS-based authentication.

While text message verification is significantly better than having no MFA at all, authentication apps offer additional security benefits, including:

• Protection against SIM-swapping attacks

• Faster approval processes

• Enhanced phishing resistance

• More reliable authentication experience

Organizations implementing MFA should consider app-based authentication whenever possible.

MFA Is One of the Highest-Impact Security Investments

Many cybersecurity initiatives require substantial investments in technology, training, or infrastructure. MFA is different.

It is relatively easy to deploy, inexpensive to maintain, and provides an immediate reduction in risk. Few security controls can demonstrate a 99%+ reduction in account compromise risk.

For small businesses, nonprofits, and large enterprises alike, MFA represents one of the most effective steps an organization can take to protect sensitive information, financial data, and customer records.

Make MFA the Default

The findings from Microsoft's research are clear: MFA works.

Organizations that have not yet implemented MFA should make it a priority. Those already using MFA should evaluate whether they are leveraging the strongest authentication methods available.

Cybercriminals continue to target passwords because they know many organizations still rely on them. By enabling MFA, businesses can dramatically reduce their exposure to unauthorized access and strengthen their overall cybersecurity posture.

When it comes to protecting your organization, MFA is no longer a "nice-to-have" feature—it is a business necessity.

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Under U.S. Treasury regulations, any tax advice in this communication is not intended or written to be used to avoid IRS penalties. Tzinberg & Associates provides this information for general guidance only. It does not constitute tax advice, accounting services, investment advice, or professional consulting. Consult a professional adviser before making decisions or taking action, as the information is provided "as is" without any warranties regarding its completeness, accuracy, or timeliness.