One Telegram Upload, 1,907 Stolen Logins: The Vuln_SMTP Leak

HEROIC analysts discovered a combolist called "Vuln_SMTP," uploaded by a Telegram user and dated June 27, 2026. The file contains 1,907 records pairing email addresses with plaintext passwords, along with the URLs of the sites those credentials were tied to.

Why the Vuln_SMTP Leak Is Dangerous

The name suggests this list was pulled together from vulnerable email server logins, and because the passwords are stored in plaintext, anyone who obtains the file can use each email and password pair right away. The included URLs point attackers to the exact service each credential was used for, which is especially risky if any of those accounts are email or SMTP logins, since email access can be used to reset passwords on other accounts.

What Was Exposed in Vuln_SMTP

• Email addresses
• Plaintext passwords
• URLs tied to each set of credentials

Why This Matters for the 1,907 Accounts Involved

If your email address is one of the 1,907 records in this list, an attacker already has a working password to try. Because so many people reuse passwords, that single set of credentials can open the door to credential stuffing attempts against banking, shopping, and social media accounts, not just the one it was originally tied to. This is how account takeover and identity theft often start, from one reused password rather than a single massive hack.

How This Combolist Was Put Together

A combolist compiles login credentials, typically gathered from malware, phishing pages, or older breaches, into a single file of email and password pairs. Vuln_SMTP appears to focus specifically on logins tied to vulnerable mail servers, a niche but valuable target since compromised SMTP accounts can be used to send further phishing emails or intercept password reset messages. Lists like this circulate on Telegram and dark web forums where attackers test credentials for reuse.

Check If You Are Affected

With 1,907 records already exposed, checking your own exposure only takes a moment. HEROIC's free breach scanner searches your email against a database of more than 400 billion leaked records, including lists like Vuln_SMTP, so you can see if you are affected and secure your accounts before someone else uses your credentials.