The Vuln_SMTP Leak: 3,676 Passwords Exposed. Yours Might Be One.

HEROIC analysts identified a combolist file named Vuln_SMTP that was uploaded to a Telegram channel on June 29, 2026. The file contains 3,676 records pairing email addresses with plaintext passwords and the login URLs where those credentials were meant to be used. Why This Is Dangerous: These passwords were not encrypted or hashed. They sit in plain, readable text, which means anyone who opens this file can immediately copy and paste each email and password pair into a login page and try it. There is no cracking, guessing, or technical skill required. What Was Exposed: - Email addresses - Plaintext passwords - Associated login URLs Why This Matters: If you have ever reused a password across multiple accounts, this leak puts every one of those accounts at risk. Attackers run these exact email and password combinations against banking sites, email providers, and shopping platforms in a process called credential stuffing. When a match hits, the result can be a locked-out email account, drained loyalty points, unauthorized purchases, or a foothold an attacker uses to reset passwords on other services tied to that inbox. How Combolist Leaks Work: A combolist is simply a text file that combines usernames or emails with passwords, usually gathered from older breaches, malware, or public dumps, then repackaged and passed around on channels like Telegram. Criminals do not need to hack anything new. They load the file into automated tools that test thousands of logins per minute across popular websites, then keep whatever accounts respond. Check If You Are Affected: HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including combolists like Vuln_SMTP. Run a free scan to see if your credentials showed up here and get guidance on which passwords to change first.