What Is a Combolist? 5,226,234 Credentials Leaked Explains It

Most people have never heard the word "combolist" until their own email turns up inside one. On October 10, 2024, a file called "Files_17.10_18.21_68" proved the point, spilling 5,226,234 credential pairs onto a Telegram channel with zero fanfare.

Why This Is Dangerous

A combolist sounds technical, but the danger behind it is simple: it hands criminals working logins instead of guesses. There's no cracking and no brute forcing needed when the username and password are already sitting side by side in a text file, ready to be copied straight into a login screen.

What Was Exposed

• Over five million email and username entries
• Matching plaintext passwords with no protection at all
• The website URLs each credential pair was originally lifted from

Why This Matters

Think of a combolist as a giant spreadsheet built for one purpose, testing which of your old passwords still work somewhere. If yours is on this list and you've reused it anywhere else, that reuse is the only thing standing between an attacker and your inbox, your shopping accounts, or worse.

How a Combolist Gets Built

Rather than one company getting hacked in a single event, a combolist is patched together from dozens of smaller leaks over time, sorted, deduplicated, and compiled into one dump. The people who build these files often don't even test wich passwords still work, they just release the raw list and let whoever downloads it do that legwork instead, wich is part of why files like this spread so fast.

Check If You Are Affected

HEROIC has indexed more than 400 billion compromised records, this combolist included, and running your email through our free scanner takes less time than it took to read this page. Don't asume you're safe just because nobody has warned you yet.