ARCEUSULP 129 1384098 uploaded by a Telegram User – 554,723 Leaked

In June 2026, HEROIC analysts tracked a combolist file titled "ARCEUSULP 129 1384098," uploaded to a Telegram channel by an unidentified user on June 20, 2026. The file contained 554,723 records pairing email addresses with plaintext passwords, along with the URLs of the accounts they unlock.

Why This Combolist Is Dangerous

Unlike hashed or encrypted credential dumps, this list stores passwords in plaintext, meaning anyone who downloads it can read and use the passwords immediately, with no cracking required. Combined with the URLs included in the file, attackers have a ready-made map of which site each email and password combination unlocks, making it easy to automate logins across hundreds of thousands of accounts at once.

What Was Exposed

• Email addresses
• Plaintext passwords
• Account URLs

Why This Matters

If you reuse a password across multiple accounts, a single row in this combolist can be enough to unlock your email, banking, or social media logins elsewhere. Attackers use lists like this one to run credential stuffing attacks, testing the same email and password pair against dozens of popular websites automatically. When a match hits, the result can be account takeover, financial fraud, or identity theft, often before the victim even realizes their information was exposed.

How Combolists Work

A combolist is a plain text file that combines usernames or email addresses with their matching passwords, typically gathered from older breaches, phishing campaigns, or malware infections and then repackaged for resale or free distribution. Criminals compile combolists because they remove the guesswork: instead of hacking a system directly, an attacker simply loads the list into automated tools that try each login across banking sites, email providers, and social platforms until something works.

Check If You Are Affected

With 554,723 credential pairs now circulating, the safest move is to find out if your email address is part of this exposure. HEROIC's free breach scanner checks your email against more than 400 billion leaked records, including this combolist, so you can see immediately if your credentials were exposed and take action before someone else uses them.