UK Mix Fresh Combolist Leaked More Records Than Seattle’s Population

HEROIC analysts identified a file labeled "COMBOLIST 1M UK MIX FRESH" that appeared on a Telegram channel on 29 October 2025. While the file's own name advertises 1 million entries, HEROIC's verification confirmed 781,543 genuine records, each containing an email address, a plaintext password, and the login URL tied to that account. To put that in perspective, this single combolist contains more entries than the entire population of Seattle.

Why This Is Dangerous

The "FRESH" label in the file's name is a warning sign in itself. It signals that these credentials have not been widely circulated or checked to death by other attackers, meaning the passwords are more likely to still be active. Combined with the fact that every password is stored in plaintext, this file gives an attacker an enormous, largely untested pool of working logins to test against real accounts.

What Was Exposed in the UK Mix Fresh Combolist

• Email addresses for 781,543 accounts
• Plaintext passwords paired with each address
• The login URLs where each set of credentials was used

Why This Matters

A combolist this large is built for volume attacks. Criminals load files like this into automated tools that rapidly test each email and password pair against banking sites, email providers, and retail accounts, a technique known as credential stuffing. Because so many people reuse the same password across multiple sites, a single working login from this file can cascade into stolen bank accounts, hijacked email, and full identity theft for hundreds of thousands of people.

How Combolists Like This Get Built

A combolist is a compiled file of email and password pairs gathered from multiple sources, often stitched together from stealer log malware infections, older breaches, and previously leaked data. Whoever assembled this "UK MIX FRESH" batch pulled from various origins, filtered it down, and packaged it into one large file before uploading it for others to use or resell. The "mix" in the name reflects that variety, while "fresh" signals the credentials had not yet been widely tested or burned by other attackers before this release.

Check If You Are Affected

With over 781,000 accounts in a single file, this is one of the larger combolists HEROIC has tracked recently, and the odds that your email is included are meaningful. HEROIC's free breach scanner checks your email against more than 400 billion leaked records, including combolists like this one, so you can find out if you are exposed and update your passwords before an attacker gets there first.