The uclm.es Leak Exposed 553 Emails and Plaintext Passwords

HEROIC analysts identified a combolist file uploaded to a Telegram channel in May 2026 containing 553 records tied to uclm.es. The file pairs email addresses with plaintext passwords and includes associated URLs, giving anyone who downloads it a ready-made list of working login credentials.

Why This Is Dangerous

Because the passwords in this dump are stored in plaintext, no cracking is needed. Anyone who obtains the file can immediately start testing the 553 email and password pairs against other websites. If even a handful of these users reused their password elsewhere, those accounts are now exposed to whoever has this file.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated URLs

Why This Matters

Small leaks like this one are still valuable to attackers because they are often folded into larger credential-stuffing tools that automatically try each email and password pair against banking, email, and social media logins. A single reused password can lead directly to account takeover, and from there to identity theft or financial fraud.

How Combolists Work

A combolist is a compiled text file of email and password pairs, often gathered from older breaches, phishing pages, or stealer malware and reformatted into one list for easy use. Even a small combolist like this 553-record file gets copied, merged with other lists, and redistributed across Telegram channels and forums, so its reach can grow well beyond its original size.

Check If You Are Affected

The only way to know if your email address was part of this leak is to check it directly. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, so you can find out in seconds whether your credentials have been exposed and change your password before someone else uses it.