The ARCEUSULP Combolist Exposed Login Data for 1,275 Email Users

HEROIC analysts identified a file called "ARCEUSULP 138 1276" circulating on Telegram on June 20, 2026. The upload contains 1,275 records made up of email addresses paired with plaintext passwords and the login URLs they belong to, a batch of unrelated login credentials pulled together under a single file name.

Why the ARCEUSULP 138 1276 Combolist Is Dangerous

A combolist like this one is dangerous precisely because it requires no extra work from an attacker. The passwords are stored in plaintext, so there is no encryption to crack and no hashing to break. Anyone who downloads the ARCEUSULP 138 1276 file can immediately start testing the 1,275 email and password pairs against email providers, banking portals, social media platforms, and online stores.

This kind of automated testing is called credential stuffing, and it works because so many people reuse the same password across multiple accounts. If your email and password appear in this file and you have used that same password anywhere else, an attacker does not need to guess anything. They just try the combination and see what opens.

What Was Exposed in the ARCEUSULP 138 1276 Combolist

• Email addresses
• Plaintext passwords
• Associated login URLs

Why the ARCEUSULP 138 1276 Leak Puts Your Accounts at Risk

Once credentials from a combolist like ARCEUSULP 138 1276 start circulating, the risk moves quickly beyond the original account. Attackers use working email and password pairs to attempt logins on banking sites, retail accounts, and email providers, since a compromised email inbox can be used to reset passwords on almost every other account tied to it.

From there, the path to identity theft and financial fraud is short. An attacker who gets into your email can find bank statements, tax documents, and password reset links. An attacker who gets into a reused password on a shopping site can place orders or drain stored payment methods. This is why a leak of 1,275 records, even one that looks small next to headline-making breaches, still represents real risk to every person on the list.

How the ARCEUSULP 138 1276 Combolist Was Likely Built

Combolists like ARCEUSULP 138 1276 are usually assembled by combining older leaked data from multiple sources, credentials harvested by malware, or details gathered through phishing pages, then merging them into a single list of email and password pairs. The person who uploaded this file to Telegram did not necessarily breach a single company. Instead, they compiled working credentials from various origins and packaged them for other threat actors to use or resell.

This is a common pattern in the criminal underground: raw or previously leaked credentials get repackaged into "fresh" combolists and shared or sold on Telegram channels and dark web forums, giving them a second life long after the original exposure.

Check If You're Affected by the ARCEUSULP 138 1276 Leak

If you think your email address could be part of the ARCEUSULP 138 1276 combolist, or any of the other breaches we track, HEROIC's free breach scanner checks your information against a database of more than 400 billion leaked records. Run a scan to see whether your email and password appear in this leak or any other, and if they do, change that password everywhere you have reused it.