Credential leak checker for email breach detection.
Check if an email address has been exposed in known data breaches and identify compromised sources instantly.
About
Credential leaks occur when email addresses and associated passwords are exposed through data breaches, database dumps, or unauthorized access to third-party services. Once leaked, these credentials circulate on dark web forums and paste sites, enabling attackers to attempt unauthorized access through credential stuffing, password spraying, and targeted phishing campaigns.
This tool checks whether a given email address appears in known breach databases and surfaces the sources where the exposure was detected. Regularly checking for credential leaks is a fundamental practice recommended by security frameworks including NIST SP 800-63B, which advises organizations to verify that credentials have not been compromised in prior breaches.
How credential leaks happen
- Data breaches — Attackers compromise a service and exfiltrate user databases containing emails, passwords, and personal data. High-profile breaches at companies like LinkedIn, Adobe, and Dropbox have exposed hundreds of millions of credentials.
- Third-party compromise — A vendor or SaaS provider you rely on suffers a breach, indirectly exposing your organization's credentials even though your own systems were not targeted.
- Credential stuffing — Attackers use previously leaked email/password pairs to attempt login on other services, exploiting password reuse across platforms.
- Phishing and social engineering — Users are tricked into entering credentials on malicious sites that harvest and redistribute the captured data.
- Infostealer malware — Malware installed on compromised devices silently exfiltrates saved credentials from browsers, email clients, and password managers.
How to interpret results
| Field | What it tells you | What to watch |
|---|---|---|
| Status | Whether the email was found in any known breach database. | "Leaked" status requires immediate action — password changes and 2FA. |
| Breach count | Number of distinct breach sources where the email appeared. | Multiple sources indicate widespread exposure and higher risk. |
| Source name | The service or database where the credential was found. | Prioritize recent and high-profile sources for remediation. |
| Breach date | When the breach was recorded or discovered. | Recent breaches pose higher risk — credentials may still be active. |
What to do if your email is compromised
- Change passwords immediately — Update the password on every service where you used the compromised email. Use a unique, strong password for each account.
- Enable two-factor authentication (2FA) — Add a second layer of protection using an authenticator app or hardware key. Avoid SMS-based 2FA when possible.
- Review account activity — Check recent login history on critical accounts (email, banking, cloud services) for unauthorized access.
- Use a password manager — Generate and store unique passwords for every service to eliminate password reuse across platforms.
- Monitor continuously — Set up ongoing credential monitoring to receive alerts when new breaches are detected. Splorix provides continuous monitoring for organizations.
Use cases
- Verify employee email exposure during security assessments and incident response.
- Support security awareness training with real-world breach data.
- Audit vendor and third-party risk by checking partner email domains.
- Validate compliance with credential monitoring requirements (NIST, ISO 27001, SOC 2).
- Detect compromised service accounts before attackers exploit them.