If your business relies on just passwords for security—this one’s for you.

Password spraying is a stealthy cyberattack technique that hackers love because it flies under the radar. Unlike traditional brute-force attacks that hammer one account with loads of passwords, password spraying flips the script—trying one common password across many accounts.

Why does this work? Because people reuse weak passwords. And if even one account is using “Welcome123” or “Summer2024,” a hacker can gain access without raising red flags.

Let’s break it down and explore how to stop it.

What Is Password Spraying and How Does It Work?

Password spraying is a type of brute-force attack, but with a twist. Instead of targeting one account with lots of password attempts (which triggers account lockouts), attackers try a few common passwords across a large number of usernames. This technique avoids detection and maximises success.

Here’s the typical process:

• Hackers gather usernames from public sources, company directories, or leaked databases
• They choose commonly used passwords like “Password1,” “Spring2023,” or variations of company names
• Automated tools try these passwords across hundreds or thousands of accounts
• Attempts are slow and spread out to stay under the radar of security systems

This makes it incredibly effective—especially against organisations that don’t enforce strong password policies or multi-factor authentication.

Password spraying has become a go-to method in targeted business attacks. Staying vigilant is key.

How Is It Different from Other Attacks?

Password spraying differs from traditional brute-force attacks because it avoids lockouts. It’s also different from credential stuffing, which uses known username/password pairs from previous breaches.

Key differences:

• Brute-force attacks: Target one account with many passwords
• Credential stuffing: Use breached credentials across services
• Password spraying: Use one (or a few) passwords across many accounts

Because it mimics normal login activity, password spraying can be harder to detect—especially in systems without behavioural analytics.

Why Password Spraying Is So Dangerous

This method is popular with hackers because:

• It exploits the weakest link: human behaviour
• It can bypass traditional defences
• It often goes unnoticed until serious damage is done

Once inside, attackers can:

• Steal sensitive company data
• Access emails to launch phishing attacks
• Escalate privileges to take control of systems

And because they’re using valid login credentials, even basic security tools may not flag it.

How to Defend Against Password Spraying

The good news: you can protect your organisation with some straightforward measures.

✅ Enforce Strong Password Policies

Make sure your users create long, complex, and unique passwords. Avoid common phrases, dictionary words, or anything tied to the business name.

Need help? Explore our blogs under Data Security for more advice.

✅ Enable Multi-Factor Authentication (MFA)

MFA ensures that even if a password is compromised, an attacker can’t get in without a second authentication method. App-based authenticators and hardware keys are more secure than SMS.

✅ Monitor Login Activity

Look out for:

• Repeated login attempts from the same IP address
• Logins from unusual geographical locations
• Multiple failed attempts across accounts

Security software with behavioural analysis and alerts can help catch suspicious patterns.

✅ Educate Your Team

Your users are your first line of defence. Regular training helps them:

• Understand what password spraying is
• Spot phishing emails and suspicious login prompts
• Use password managers to avoid reuse

Additional Security Tactics

On top of the core strategies, here are some additional ways to reduce your risk:

• Configure account lockout policies to block access after several failed login attempts (with caution to avoid denial-of-service risks)
• Restrict access to login portals with IP whitelisting or geo-blocking
• Use Single Sign-On (SSO) and centralised identity management to apply consistent security rules
• Conduct regular security audits to spot vulnerabilities and outdated practices

Final Thought: Don’t Let One Weak Link Compromise Everything

Password spraying is a low-effort, high-reward tactic—and it works far too often. But a few smart practices can shut it down completely.

Want help reviewing your account security?

Get in touch or check out our Cybersecurity services to find out how we can support you.

Article used with permission from The Technology Press.

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