ARCEUSULP 248 Leak: 10.6 Million US Email Logins Exposed

ARCEUSULP 248: A 10.6 Million Record Combolist Tied to the United States

HEROIC analysts tracked a combolist labeled "ARCEUSULP 248 23423603," uploaded to a Telegram channel and added to our breach intelligence database. The file contains 10,608,823 records of email addresses paired with plaintext passwords and login URLs. It is tagged to the United States and the underlying credentials were leaked on 20 June 2026.

Why This Is Dangerous

At more than 10.6 million records, this is one of the largest files in this batch, and its US tagging means the accounts inside are likely to work on American banking, retail, and social platforms that attackers specifically target. Every record pairs a plaintext password with the exact URL it unlocks, so no guesswork is needed to put the credentials to use.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated login URLs

Why This Matters

A list of this size, focused on one region, is exactly what credential stuffing operations look for: a large pool of likely-valid logins concentrated on services common to that market. If your password shows up here and you reused it on a US bank, retailer, or social account, you face a real risk of account takeover, identity theft, or financial fraud, even if you have never heard of ARCEUSULP.

How a Combolist Like This Gets Built

Large combolists like this one are usually assembled by merging several smaller breach or malware-derived lists into one file, then labeling and tagging them, in this case to a specific country, so buyers know which market the logins are likely to work in. The scale comes from combination, not from a single hack of one company.

Check If You Are Affected

With over 10.6 million records in this one file alone, checking your exposure matters. HEROIC's free breach scanner searches your email against more than 400 billion leaked records, including this ARCEUSULP 248 file, so you can find out quickly and secure any accounts that come back compromised.