How to Tell if Your Password Has Been Leaked

Learn how to check if your password has been leaked using Have I Been Pwned and what steps to take if your account is compromised.

Date: 29/09/2025

Introduction

Imagine logging into your email one day and discovering it’s been hacked. Not good! Credential abuse is the #1 initial attack vector in 2025 (Verizon DBIR), which means stolen passwords are the most common way attackers broke into accounts and systems at the time of writing.

That makes it clear why protecting your credentials matters, we’ll walk you through how to check if your email or password has appeared in data breaches using Have I Been Pwned, why it matters, and the exact steps to take if your accounts have been compromised. Many data breaches expose millions of accounts at once, so checking regularly is an important habit to protect yourself. See references at the end for details and official guidance.

What You’ll Learn

• How to quickly check if your password or account has been leaked online
• What to do immediately if your account shows up in a breach
• How to strengthen your password security to avoid future risks
• Why tools like Have I Been Pwned are essential for staying safe online

How to Check if Your Password Has Been Leaked

Have I Been Pwned (HIBP) is a free, widely trusted website you can use to check if your email address or password has appeared in a known data breach. It was launched in 2014 by security researcher Troy Hunt and is used by individuals, organisations, and governments worldwide to monitor breach exposure.

Using it is simple:

1. Go to haveibeenpwned.com.
2. Enter the email address you use for online accounts.
3. Check the results to see if it has been involved in any breaches and what data was exposed (emails only, or also passwords and other personal data).
4. Optionally, use the ‘Pwned Passwords’ tool to check whether a specific password (in hashed form) appears in breach datasets. Do not paste your current active password into random websites; use the HIBP tool or integrations in reputable password managers.

Why this matters: Stolen credentials are frequently reused in attacks, known as credential stuffing, and are a leading cause of account takeover. The 2024 Verizon Data Breach Investigations Report highlight stolen credentials and credential misuse as top causes of breaches.

What to Do If Your Account Appears in a Breach

It can be overwhelming finding that your email or password has shown up in a breach, but try not to panic, you’ve found the risk which now means you can address it. Just follow these practical steps in order:

• Confirm the Breach and Assess the Scope: Check the HIBP results to see what fields were exposed (email only, plain-text passwords, hashed passwords, credit-card data, etc.). If financial or identity data was exposed, take stronger actions such as contacting your bank or monitoring credit reports.
• Change Your Passwords Immediately: Update the password on the affected account and any other accounts that used the same password. Use a password manager to generate and store long, unique passwords. This is one of the most effective defenses endorsed by CISA and NIST. See our Beginners Guide to Password Managers Here!
• Enable Multi-Factor Authentication (MFA): Turn on MFA on all critical accounts (email, bank, social media). Use an authenticator app or where possible; it’s more secure than SMS or e-mail based codes. Experts recommend enabling MFA to block attackers even if a password is compromised.
• Monitor and Stay Proactive: Watch for phishing attempts that reference the breach, check bank and credit card statements, and sign up for breach notifications. The FBI’s Internet Crime Complaint Center (IC3) report rising losses from cybercrime, so stay alert and report suspicious activity.

How to Safely Change Passwords Using a Password Manager

• Open your password manager (we recommend Bitwarden for free, 1Password for paid, or another reputable manager).
• Locate the affected login and use the built-in password generator to create a long (12+ characters recommended) passphrase or password.
• Update the password on the site’s account settings page directly (not via links in emails).
• Save the new login in your password manager so it syncs across devices.
• If you used the old password elsewhere, repeat these steps for those accounts.

Tip: NIST guidance emphasizes using memorably long passphrases and checking passwords against breach databases like HIBP when setting new passwords. A password manager can do both of these for you.

Common Mistakes and Myths About Data Breaches

• Myth: ‘If nothing has happened yet, I’m safe.’
  Reality: Stolen data can be misused months or years later; attackers reuse and combine breached data in different attacks.
• Myth: ‘One breach won’t affect me.’
  Reality: Different breaches can expose different data points that attackers stitch together to take over accounts. Credential reuse is a major factor in account takeover incidents. (Verizon 2024 DBIR)
• Myth: ‘Changing my password once is enough.’
  Reality: If you reuse passwords across services, attackers can attempt to access many accounts; unique passwords per account are essential. (CISA)
• Myth: ‘Data breach notifications are always legitimate.’
  Reality: Scammers often send fake breach alerts. Verify notifications using trusted services like Have I Been Pwned rather than clicking email links.

FAQs

Q: How do I know if my password has been leaked?
A: Use Have I Been Pwned to safely check your email address or the Pwned Passwords dataset. Do not paste active passwords into unknown sites; use HIBP or trusted tools.

Q: Is Have I Been Pwned safe to use?
A: Yes. HIBP is run by security professional Troy Hunt and is widely used by security teams and password managers. It provides transparency about data handling and never exposes raw breached passwords to users.

Q: What should I do if my email shows up in multiple breaches?
A: Change passwords, enable MFA, monitor accounts, and consider credit monitoring if financial data was involved. Sign up for notifications from HIBP and keep your security tools up to date.

Summary

• Check your email on Have I Been Pwned and review the breach details.
• If compromised, change your password(s) immediately and use a password manager for unique, long passwords.
• Enable MFA on all critical accounts (email, banking, social media). (CISA)
• Monitor financial statements and report suspicious activity to your provider or to IC3 if in the U.S.

References

1. Have I Been Pwned (Pwned Passwords)
   
2. Troy Hunt (Have I Been Pwned)
   
3. CISA: Use Strong Passwords / Use a Password Manager
   
4. NIST SP 800-63B: Memorized Secrets
   
5. Verizon 2024 Data Breach Investigations Report (DBIR)
   
6. FBI IC3 / Internet Crime Reports