Synthient Credential Stuffing Threat Data Data Breach

What Happened

During 2025, the threat-intelligence firm Synthient aggregated 2 billion unique email addresses disclosed in credential-stuffing lists found across multiple malicious internet sources. Comprised of email addresses and passwords from previous data breaches, these lists are used by attackers to compromise other, unrelated accounts of victims who have reused their passwords. The data also included 1.3 billion unique passwords, which are now searchable in Pwned Passwords.

Compromised Data

Email addresses
Passwords

Recommended Actions

Change Your Password

If you haven't changed your password on this service since the breach, do so immediately.

Enable Two-Factor Authentication

If 2FA is supported, add an extra layer of security to your account.

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Breach Overview

  • Affected Accounts:

    2 billion

  • Breach Occurred:

    April 2025

  • Added to HIBP:

    5 Nov 2025

Recommended Actions

Change Your Password

If you haven't changed your Synthient Credential Stuffing Threat Data password since 2025, do so immediately.

Enable Two-Factor Authentication

Add an extra layer of security to your account.

Sponsored
Aura

Get Aura for identity theft and credit protection. Keep your assets safe with fast fraud alerts, instant credit lock, and $1,000,000 identity theft insurance. Speak to a U.S. based fraud specialist 24/7.

Try Aura
Sponsored
1Password

Use a password manager to generate and store strong, unique passwords for all your accounts. 1Password helps protect your data with industry-leading security.

Try 1Password