Inside the Mix Fresh B4_Jx Combolist: How 1,072 Logins Got Exposed

HEROIC analysts identified a fresh combolist labeled "Mix Fresh B4_Jx" that a Telegram user uploaded on March 27, 2026. The file contains 1,072 records pairing email addresses with plaintext passwords and the URLs of the accounts each pair unlocks. Though the total is small, every record is a working set of login credentials sitting in the open. Why this is dangerous: this file skips every step an attacker would normally need to take. The passwords are unencrypted, and the accompanying URLs tell a criminal exactly which website or service each login belongs to. That combination means someone could start testing logins the moment they download the file, with no cracking, guessing, or extra research required. What was exposed: the dataset lists email addresses, plaintext passwords, and the specific URLs tied to each credential pair, effectively a ready-made target list for anyone looking to break into accounts. Why this matters: even a small combolist like this one can cause outsized damage if the people in it reuse passwords across multiple accounts, which most people do. Attackers use these lists for credential stuffing, running each email and password pair against banking sites, email providers, and social media platforms to see what still works. A single successful match can lead to account takeover, identity theft, or direct financial loss. How a combolist like this gets built: a combolist is simply a collection of username, password, and often URL combinations gathered from older breaches, stealer malware infections, or phishing pages, then filtered and repackaged into a single "fresh" file. Sellers and Telegram users label these lists as "fresh" or "mixed" to signal that the credentials have not been widely circulated yet, which makes them more valuable since the accounts are less likely to have already changed their passwords. This is exactly the kind of file that gets traded quietly before it ever reaches a public leak site. Check if you are affected: if you have used an email address for any online account in the United States, take a moment to check whether your credentials appear in this or another leak. HEROIC's free breach scanner searches more than 400 billion leaked records in seconds, so you can find out quickly and change any exposed passwords before someone else uses them.