One Telegram Upload. 10,113 Passwords. The Besttempmail.com Leak.

HEROIC analysts found a stealer log tied to besttempmail.com that a Telegram user uploaded on 10 June 2026. One file, one upload, 10,113 records, each pairing an email address with a plaintext password and the URL of the login page that password was used on.

Why This Is Dangerous

This data did not come from a hack of besttempmail.com's own servers. It came from infostealer malware running on infected devices, quietly copying login details as people entered them. Because the passwords in this file are stored in plaintext, an attacker can read all 10,113 of them the moment the file is opened, with no cracking needed. The URL tied to each record tells an attacker exactly which login page a stolen password belongs to.

What Was Exposed

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

Why This Matters

With over 10,000 records in a single file, this is one of the larger stealer logs to surface recently. Attackers take stolen credentials like these and test them against banking, email, and shopping accounts through credential stuffing, betting that people reused passwords. Every successful match is a potential account takeover, which can quickly escalate into identity theft or financial fraud.

How Stealer Logs Work

Infostealer malware infects a device through a malicious download, phishing link, or infected attachment, then silently copies saved passwords, autofill data, and session cookies from the browser. That stolen information is bundled into a log file and sent to the attacker, often within hours of infection. Logs like this one are then sold or freely shared on Telegram, which is exactly how this besttempmail.com related file ended up circulating.

Check If You Are Affected

If you have ever used besttempmail.com or reuse passwords across your accounts, it is worth checking whether your information appears in this exposure. HEROIC's free breach scanner searches more than 400 billion leaked records so you can confirm your exposure and change any affected password right away.