Why Multi-Factor Authentication Alone Isn't Enough

Multi-factor authentication (MFA) is one of the most effective security tools available, and every organization should require it for systems containing employee and benefit information. However, HR and benefits professionals should understand that MFA is no longer a guarantee that an account cannot be compromised.

Cybercriminals increasingly target employees through sophisticated phishing and social engineering attacks designed to bypass MFA rather than defeat it.

How Attackers Get Around MFA

Rather than trying to break the technology, attackers often trick users into helping them gain access. Common techniques include:

• Phishing websites that closely resemble legitimate login pages and capture usernames, passwords, and MFA codes.
• Session hijacking, where attackers steal an authenticated browser session after a user successfully logs in, allowing access without needing the MFA code again.
• Social engineering, such as posing as an IT support representative, payroll provider, bank, or insurance carrier and convincing an employee to approve an unexpected MFA prompt or disclose a verification code.

These attacks rely on human behavior rather than technical vulnerabilities.

Why HR Is a Frequent Target

HR and benefits staff routinely have access to highly sensitive information, including:

• Employee Social Security numbers
• Payroll and direct deposit information
• Health plan enrollment data
• FSA and HSA information
• Dependent information
• Tax records and employment documents

Compromising a single HR account can provide attackers with access to valuable personal and financial information or enable fraudulent payroll and banking changes.

What Employees Should Do

Even with MFA enabled, employees should remain alert for suspicious activity.

If you receive an unexpected MFA prompt, do not approve it simply because it appears on your phone or authentication app. An unexpected prompt may indicate that someone has obtained your password and is attempting to access your account.

Employees should also:

• Verify unusual requests for payroll, banking, or benefits changes using a known telephone number or another trusted communication method.
• Be cautious of emails directing you to log into unfamiliar websites or update account information.
• Never share MFA verification codes with another person, including someone claiming to be from IT or a software vendor.
• Report suspicious emails, login prompts, or account activity immediately, even if no information was disclosed.

HR Takeaway

Multi-factor authentication remains an important layer of protection, but it works best when combined with informed employees and strong business processes. Verifying unusual requests, questioning unexpected login prompts, and promptly reporting suspicious activity can prevent a phishing attempt from becoming a costly data breach.

For HR professionals who handle employee and benefits information every day, a few extra moments of verification can make all the difference.