The IT Combolist Leak Means Attackers Have 147,800 Working Logins

HEROIC analysts identified a combolist file labeled simply IT uploaded to a Telegram channel in April 2026. This is one of the larger files HEROIC has indexed from this source, containing 147,800 records pairing email addresses with plaintext passwords and the URLs those accounts belong to. Why This Is Dangerous: With this many working credentials in a single file, attackers do not need to target anyone specifically. They simply run the entire list against popular websites in bulk, using automated tools that test thousands of logins per minute. Because the passwords are stored in plaintext, there is no encryption slowing that process down. What Was Exposed: - Email addresses - Plaintext passwords - URLs tied to the accounts Why This Matters: A combolist of this size is exactly the kind of file that powers large-scale credential stuffing attacks, where attackers hammer login pages across banking, email, and shopping sites hoping a percentage of the 147,800 pairs still work somewhere. If your email and password are in this file, and you reused that password on even one other account, an attacker could be logging into it right now. At this scale, the risk isn't hypothetical, it is a matter of when, not if, someone tries your credentials. How a Combolist Like This Works: A combolist pairs usernames or emails with passwords, typically assembled from multiple smaller breaches, phishing campaigns, and stealer logs and merged into one large file. Files of this size circulate widely on Telegram, where they are traded, resold, and run through automated login checkers by many different attackers, each looking for accounts where the old password still works. Check If You Are Affected: Run a free scan against HEROIC's database of more than 400 billion breached records to see if your email address appears in this leak or any other. If it does, change that password immediately, avoid reusing it anywhere else, and turn on two-factor authentication wherever it is available.