100K Combo Yahoo Leak: Check If Your Login Was Exposed Now

On February 28, 2023, a Telegram user uploaded a combo list labeled "100k Combo Yahoo 2," exposing 83,365 records of stolen login data tied to Yahoo accounts. The file contained email addresses, plaintext passwords, and the URLs of the websites those credentials were used on. This is not a breach of Yahoo's own systems. It's a collection of Yahoo account logins stolen from individual users' infected devices through stealer malware and then compiled into a combo list for distribution.

Ask Yourself: Is Your Yahoo Login in This List?

A "combo list" is simply a file of email-and-password pairs collected from multiple sources and combined into one document, ready for an attacker to test against other sites. This particular batch carries 83,365 Yahoo logins with the passwords stored in plaintext, exactly as the victims typed them. There's no encryption to break and no hash to crack, so if your Yahoo credentials are in here, whoever holds this file can try them right now.

What Was Exposed

• Yahoo email addresses
• Plaintext passwords
• URLs of the websites the credentials were used on

Why This Matters

Ask yourself how many other accounts share the same password as your Yahoo login. That's exactly what attackers check first. Combo lists like this one exist specifically to fuel credential stuffing, feeding stolen email-and-password pairs into automated tools that try them against banking sites, social media, and other email providers. When one of those attempts succeeds, it can lead to account takeover, identity theft, and financial fraud, often before you notice anything is wrong.

How a Combo List Like This Gets Built

Stealer malware typically arrives disguised as cracked software, a fake browser update, or a malicious attachment. Once it's running on a device, it quietly scans the browser for saved passwords, autofill entries, and the web addresses tied to them, including Yahoo logins, then sends everything back to whoever controls the malware. Criminals then take stolen credentials from many different infections and merge them into a single combo list, exactly how this "100k Combo Yahoo 2" file of 83,365 records was assembled before it was shared on Telegram.

Check If You Are Affected

If you have a Yahoo account, or reuse the same password anywhere else, take a moment to check your exposure. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including combo lists like this one, and tells you instantly if your email address has turned up in a breach. If you find a match, change the password on the affected account right away, avoid reusing it anywhere else, and turn on multi-factor authentication wherever it's offered.