The ucol.mx Leak Contains Exactly 500 Email and Password Records

HEROIC analysts uncovered a Telegram-distributed combolist in May 2026 containing 500 records connected to ucol.mx. The dataset includes email addresses, plaintext passwords, and associated URLs, all formatted for immediate use rather than requiring further processing.

Why This Is Dangerous

There is no scrambling or hashing protecting these passwords, they sit in the file exactly as the victims typed them. That makes this dataset immediately usable: an attacker does not need specialized tools or time to crack anything before testing the 500 credential pairs against other accounts belonging to the same people.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated URLs

Why This Matters

Files like this one feed directly into credential stuffing, the automated process attackers use to try stolen logins across many different services at once. Because people so often reuse passwords, a leak from one domain can end up compromising accounts on completely unrelated platforms, including banking and email.

How Combolists Work

Rather than coming from a single hack, a combolist is assembled from many different leaks and logs, then cleaned up and reformatted into one easy-to-use file of email and password pairs. That assembly process is exactly what happened here: someone gathered credentials tied to this domain and uploaded them to Telegram, where combolists are traded, resold, and reused long after their initial release.

Check If You Are Affected

The fastest way to find out if you are one of the people in this dataset is to run your email through HEROIC's free breach scanner, which checks against a database of more than 400 billion leaked records. A quick search now can save you from a much bigger problem later.