The ARCEUSULP 48 Combolist Means 3.4 Million Logins Are Exposed

What HEROIC Analysts Found On 25 June 2026, HEROIC analysts uncovered a combolist labeled ARCEUSULP 48 circulating on Telegram, containing 3,390,467 records made up of email addresses, plaintext passwords, and the URLs tied to each login. This is one of the larger credential dumps HEROIC has flagged from Telegram this year. Why This Is Dangerous Picture someone scrolling through a spreadsheet with millions of working email and password combinations, ready to plug into any website they choose. That is effectively what ARCEUSULP 48 hands an attacker. With passwords stored in plaintext, there is no encryption to break through, just a list to run against banking portals, email accounts, and shopping sites until something unlocks. What Was Exposed 3,390,467 email addresses Plaintext passwords for each account URLs associated with each set of credentials Why This Matters A list this size is built for volume attacks. Criminals load files like ARCEUSULP 48 into automated tools that test each email and password pair against dozens of popular websites in seconds, a technique known as credential stuffing. Every match becomes a potential account takeover, and from there, identity theft and financial fraud become real possibilities for anyone whose password habits have not changed in years. How the ARCEUSULP 48 Combolist Came Together Combolists of this scale are almost never the product of one breach. They are stitched together over time from smaller leaks, phishing campaigns, and malware infections, then packaged and renamed before being shared on Telegram. The name ARCEUSULP 48 likely refers to the specific batch or version the uploader compiled, a common naming pattern among people who trade these files. Check If You Are Affected With more than 3.3 million records involved, the odds that your email address is somewhere in this list are higher than you might think. HEROIC's free breach scanner checks your email against a database of over 400 billion leaked records, giving you a fast, clear answer so you can secure any account still using a password from this leak.