US Yahoo Combolist Leak Exposes 83,083 Account Passwords

On February 28, 2023, a combolist labeled "100k Combo Yahoo 6" was uploaded to Telegram. Despite the "100k" in its name, the actual file contains 83,083 records, all pulled from malware-infected devices rather than from Yahoo's own servers. The exposed data includes email addresses, plaintext passwords, and the URLs each credential was tied to.

A US-Focused Combolist, Not a Yahoo Breach

It's easy to see "Yahoo" in a leak name and assume Yahoo was hacked again. That's not what happened here. This file is a combolist, a collection of stolen usernames and passwords compiled by criminals from stealer logs, filtered down to accounts associated with Yahoo login pages and tagged for a United States audience. Yahoo's systems were not breached to create this file.

What Was Exposed

• Email addresses - the login identifiers behind each account
• Plaintext passwords - readable immediately, with no encryption to break
• URLs - confirming each credential's connection to Yahoo login pages

Why This Matters

A working email and password pair is enough for an attacker to attempt account takeover, and from a Yahoo inbox they can often reset passwords on banking, shopping, and social media accounts linked to that address. That makes this combolist useful for credential stuffing, identity theft, and financial fraud, especially against anyone who reuses their Yahoo password elsewhere.

How Combolists Like This Get Made

Stealer malware infects a device and silently harvests every password saved in the browser, along with the exact site each one unlocks. Criminals then sort those raw logs by platform, pulling out every credential pointed at Yahoo and packaging it into a targeted combolist like this one for United States users. Filtering by platform and region makes the file more valuable to buyers who want a specific kind of target rather than a random mix.

Check If You Are Affected

Don't rely on the name of a leak to know if you're affected, check directly. HEROIC's free breach scanner searches more than 400 billion leaked records, including combolists like this one, and tells you immediately if your email shows up so you can secure your accounts before someone else uses them.