12.3K Combo List Leak Targets US Users: 12,154 Records Exposed

HEROIC analysts identified a stealer log dump labeled "12.3K Mix Combo list Full Valid," uploaded to a Telegram channel on 17-Jun-2026. The file contained 12,154 records tied to United States accounts, including email addresses, plaintext passwords, and the URLs of the sites where those logins were used.

Who This 12.3K Combo List Leak Targets

This is not a leak tied to one company or platform. It is a mixed batch of everyday login credentials pulled from ordinary internet users across the United States, covering whatever accounts happened to be saved in an infected browser. That mix makes it especially useful to criminals, since a single file can contain access to email, shopping, banking, or social accounts all at once.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the websites tied to each login

Why This Matters

Because each password is unencrypted and paired with the exact site it unlocks, this data allows for immediate account takeover wherever the credentials are still valid. If any of these passwords were reused across other accounts, attackers can also attempt credential stuffing to break into email, banking, or shopping profiles that share the same login.

How Stealer Logs Work

Stealer log malware infects a device, often through cracked software or a malicious download, and silently harvests saved passwords, autofill data, and browser session details as they are typed. The stolen data is compiled into a log file, often marketed as a "combo list," and sold or shared on Telegram channels and dark web forums within hours of collection.

Check If You Are Affected

If you are unsure whether your email or login details are part of this leak, use HEROIC's free breach scanner to check instantly. It searches a database of more than 400 billion breached and leaked records to show you if your information has been exposed and what to do next.