Your Data May Be Exposed: The Arceusulp Leak Hit 16,006 Records

HEROIC analysts found a combolist called "Arceusulp" shared on Telegram, dated June 20, 2026. The file contains 16,006 records made up of email addresses, plaintext passwords, and the URLs tied to each login, packaged into a single file ready for anyone to download and use.

Why This Is Dangerous

This file was not built for browsing, it was built for logging in. Every record pairs a working plaintext password with a specific email address and the exact site it unlocks, so an attacker does not need to guess anything. They can simply pull the credentials from the list and try them on the matching site right away.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the accounts tied to each login

Why This Matters

Combolists like this one power credential stuffing attacks, where the same email and password combination is automatically tested across banking sites, email providers, and social media platforms. If you have reused a password anywhere else, a single record in a list like this can lead to account takeover, financial fraud, or identity theft in a very short amount of time.

How This Combolist Was Assembled

Combolists are typically built from older breaches, stealer log outputs, or previously exposed databases, then cleaned up and reformatted into simple email:password pairs so they can be fed into automated login checkers. Once assembled, they are shared freely or sold on Telegram channels, which is exactly where HEROIC analysts located this file.

Check If You Are Affected

If you reuse passwords across accounts, it is worth checking your exposure now rather than waiting to find out the hard way. HEROIC's free breach scanner searches a database of more than 400 billion leaked records to show you whether your email and password appear in this combolist or any other exposure, so you can update your credentials before someone else uses them.