The 17-05-26 Combolist Leaked 39,841 Logins on Telegram in May 2026

In May 2026, HEROIC analysts found a combolist file labeled simply 17-05-26 being shared in a Telegram channel. Unlike breaches tied to a specific company, this file is dated rather than named, and it contained 39,841 records pairing email addresses with plaintext passwords and the URLs they were collected from. Why This Is Dangerous: Because the passwords in this file are stored in plaintext, no cracking is required. Anyone who obtains the file can read the credentials immediately and start testing them against other websites. What Was Exposed: - Email addresses - Plaintext passwords - URLs tied to each credential pair Why This Matters: Generic, date-labeled combolists like this one are usually compiled from multiple smaller sources and sold or shared as bulk inventory. Even without a recognizable brand name attached, the nearly 40,000 credential pairs inside are real accounts. If any of them match a password you still use, an attacker could use credential stuffing to break into your email, banking, or shopping accounts. How a Combolist Like This Works: Combolists are built by combining leaked or stolen username and password pairs from multiple sources, often stealer malware infections or older breaches, into a single file. They're commonly dated or numbered rather than branded, then distributed on Telegram and dark web forums as raw material for credential stuffing attacks. Check If You Are Affected: Run a free scan with HEROIC's breach scanner, which checks your email against more than 400 billion leaked records, to find out if your credentials appear in this or any other exposed dataset.