How a Combolist Named ‘corp’ Leaked 474,521 Login Credentials

In late May 2026, HEROIC analysts identified a large combolist, uploaded to Telegram under the plain name 'corp,' by an individual user. Despite the generic filename, the file contains 474,521 records, each pairing an email address with a plaintext password and an associated login URL, making it one of the larger combolists tracked recently. Why This Is Dangerous: Files like this typically come together over time, as an uploader combines credentials pulled from several older breaches, phishing pages, and malware-infected computers into one master list. The result is a huge, ready-to-use set of working logins. Since every password here is stored in plaintext, there's no extra work required before an attacker can start testing them against other sites. What Was Exposed: email addresses; plaintext passwords; associated login URLs. Why This Matters: At nearly half a million records, this file gives attackers enough volume to run large-scale credential stuffing campaigns, automatically testing each email and password pair against banking, retail, and social media logins. Anyone in this file who reused a password anywhere else faces a real risk of account takeover, and from there, financial fraud or identity theft. How Combolists Like This Get Built: Generic filenames like 'corp' often mean the list was assembled by combining smaller breach dumps and stealer logs from multiple sources, sometimes over months, before being packaged and dropped into a Telegram channel. The lack of a specific target name doesn't make the credentials any less real. It usually just means the uploader was more focused on volume than branding. Check If You Are Affected: With close to 475,000 accounts in this one file alone, there's a real chance your email is included. HEROIC's free breach scanner checks your address against more than 400 billion leaked records and tells you right away if you need to change a password.