The United Kingdom 10 Leak Targets Anyone Who Reused a Password

HEROIC analysts identified a combolist file labeled "United Kingdom 10" that a Telegram user uploaded on February 18, 2023. The file contains 219,612 records pairing email addresses with plaintext passwords, along with URLs showing which sites each login was used on.

Why This Is Dangerous

This file does not need to be cracked or decoded. The passwords are stored in plaintext, so anyone who opens the file can read the exact login a person used, and the paired URL tells them precisely where to try it. That combination removes nearly every obstacle standing between an attacker and a working login.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs linking each credential to the site it was used on

Why This Matters

The people most at risk from a file like this are not a specific group but a specific habit: reusing the same password across multiple accounts. Criminals run these email and password pairs through automated tools against banking sites, email providers, and shopping accounts in a technique called credential stuffing. A single reused password can lead to account takeover on unrelated services, opening the door to identity theft and financial fraud.

How a Combolist Like This Comes Together

A combolist is a stripped-down file of username or email and password pairs, usually pulled together from older breaches, stealer logs, and other leaked data. Because it only contains the login pairs, it loads directly into automated attack tools without extra cleanup. Files like this one regularly circulate on Telegram, where channels exist specifically for sharing and trading them.

Check If You Are Affected

If you reuse passwords across accounts, HEROIC's free breach scanner can check your email against a database of more than 400 billion compromised records. Run a scan to see if your credentials appear in this leak or any other, and change any passwords you have repeated elsewhere.