How the 31-05-26 Combolist Leak Exposed 54,788 Login Credentials

HEROIC analysts identified a combolist file named 31-05-26 uploaded to Telegram on May 31, 2026. This is a larger file than most recent uploads HEROIC has tracked, containing 54,788 records of email addresses paired with plaintext passwords and associated URLs. Why This Is Dangerous: At nearly 55,000 records, this file gives an attacker a large enough pool of credentials to run automated attacks at scale. Because every password in the file is stored in plaintext, there's no need to crack or guess anything, the credentials work as soon as they're tested. What Was Exposed: Each of the 54,788 records in the 31-05-26 file contains the same three fields. - Email addresses - Plaintext passwords - URLs tied to the accounts Why This Matters: A file this size is typically fed into automated tools that test each login against hundreds of popular websites in minutes, a tactic known as credential stuffing. Any account using a reused password becomes vulnerable, and successful logins can quickly escalate into account takeover, identity theft, or financial fraud. How the 31-05-26 Combolist Was Likely Built: Combolists at this scale are usually assembled by combining several smaller sources, older breach dumps, phishing kit harvests, and stealer malware logs, into a single file, then labeled by the date it was compiled rather than by a company name. This makes them harder to trace back to a single source, but no less dangerous to the people whose credentials appear in them. Check If You Are Affected: With over 54,000 records in this leak alone, checking your own exposure only takes a moment. HEROIC's free breach scanner searches your email against more than 400 billion breached records. If your information turns up, change that password immediately, everywhere you've used it.