The MIX 510K 4.10 Leak: 455,769 Plaintext Passwords Exposed Online

HEROIC analysts identified a combolist file named MIX 510K 4.10 that a Telegram user uploaded on April 24, 2023. The file contains 455,769 records pairing email addresses with plaintext passwords and the URLs those credentials unlock. Worth noting: the "510K" in the file name suggests a larger haul, but HEROIC's verification confirms the real count at 455,769 records, still a significant exposure. Why This Is Dangerous: Every record in this file hands an attacker a ready-made login, an email address, its plaintext password, and the exact website it works on. There is no cracking or guessing involved. Anyone who downloads this file can plug the credentials directly into login pages and see what opens up. What Was Exposed: - Email addresses - Plaintext passwords - URLs tied to each credential pair Why This Matters: Because the passwords are stored in plaintext and matched to specific URLs, this file is built for immediate account takeover. If you have reused any of these passwords elsewhere, attackers can use automated tools to test the same login across banking sites, email providers, and social media in minutes. That kind of credential stuffing is how a single leaked password turns into drained accounts and stolen identities. How a Combolist Like This Works: A combolist is a compiled file of username or email and password pairs, often stitched together from older breaches, phishing hauls, or stealer malware logs, then organized by the URL each credential works on. Criminals trade and sell these files cheaply on Telegram because they save the work of matching stolen data to a target. Once in hand, a buyer can run the whole list through automated login-testing software in a matter of hours. Check If You Are Affected: HEROIC's free breach scanner checks your email against more than 400 billion compromised records, including this one. Run a scan now to see if your credentials appear in the MIX 510K 4.10 leak or any other breach on record.