One File, 4,140 Plaintext Passwords: Inside the 71_Boss Leak

4,140 Records Leaked in the 71_Boss Stealer Log

HEROIC analysts found a stealer log file called 71_Boss, uploaded by a Telegram user on 17 July 2026. The file contained 4,140 records taken from infected computers, including email addresses, plaintext passwords, and the URLs of the sites those credentials belong to.

Why the 71_Boss Leak Is Dangerous

Look closely at how these passwords were stored, and the danger becomes obvious: every single one is in plaintext. That single detail means an attacker does not need any special tools or technical skill to use this data. They can open the file, read a password exactly as it was typed by its owner, and pair it with the listed URL to try logging in right away.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the sites the credentials were captured from

Why This Matters

If your email and password are among the 4,140 records here, the main risks are account takeover on the exact site the URL points to, and credential stuffing on any other accounts where you have used the same password. Because plaintext passwords require no extra effort to use, the window between the leak and an attacker acting on it can be very short.

How Stealer Logs Work

Stealer logs are produced by malware that infects a device, often through a cracked program, a fake download, or a malicious attachment, and then quietly copies saved browser passwords and autofill data. All of it, including the plaintext passwords seen in this leak, gets bundled into a single file and passed around or sold on Telegram and similar platforms.

Check If You Are Affected

Because plaintext passwords like these can be used the moment they're found, it is worth checking sooner rather than later. HEROIC's free breach scanner compares your email against more than 400 billion leaked records, so you can quickly confirm whether you were part of this leak and change any exposed passwords.