Leaked Credential & Data Breach Checker

See if your domain has appeared in a known data breach.

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When a service you use is breached, the leaked usernames and passwords end up in the hands of attackers who try them everywhere else — that is credential stuffing, and it is behind a huge share of account takeovers. If your domain has been in a breach, especially one that exposed passwords, the accounts tied to it are at risk right now. A leaked credential checker tells you which known breaches involve your domain, what was exposed, and when a new one appears.

What it checks

Whether your domain appears in any known data breach
Which breaches, when they happened, and how many accounts were exposed
What data was leaked — and specifically whether passwords/credentials were
A clear verdict — clean, exposed, or credentials leaked
New breaches over time, so a fresh exposure raises an alert

Why it matters

Leaked credentials are one of the most reliably exploited weaknesses because people reuse passwords across sites. A single breach that exposed passwords for your domain can cascade into compromised email, admin and customer accounts long after the original incident. Knowing exactly which breaches affect you — and being told the moment a new one is recorded — lets you force resets and enable MFA before the credentials are weaponised.

How BrandSentryPro does it

Add your domain and BrandSentryPro checks it against the Have I Been Pwned breach database, lists every breach involving your domain with what was exposed, and re-checks on a schedule — alerting you when a new breach appears so you can rotate credentials and protect affected accounts quickly.

Frequently asked questions

What does "leaked credentials" mean?

It means usernames, email addresses and often passwords for a service have been exposed in a data breach and are circulating publicly or for sale. Attackers reuse those credentials to break into other accounts, since people frequently reuse the same password.

How do you know if my domain was breached?

We check your domain against Have I Been Pwned, the well-known catalogue of publicly recorded data breaches, and report any breach whose affected service matches your domain — including what data was exposed and whether passwords were among it.

What should I do if my domain appears in a breach?

Force a password reset for potentially affected accounts, require strong unique passwords, and turn on multi-factor authentication, which blocks most credential-stuffing attacks. If user data was exposed, notify the affected users.