Combolist Explained: 10K Hotmail Private UHQ Leaks 10,374 Logins

What the 10K Hotmail Private UHQ Combolist Reveals

HEROIC analysts found a combolist titled "10k hotmail private uhq" that was uploaded by a Telegram user on 17 April 2025. The file contains 10,374 records of email addresses and plaintext passwords, along with associated URLs, tied to Hotmail accounts in the United States.

Why This Is Dangerous

Every password in this file is stored in plaintext, meaning an attacker does not need to crack or decrypt anything before using it. With over 10,000 working email and password pairs in hand, someone could log directly into thousands of Hotmail inboxes, then use those accounts to reset passwords elsewhere, read private conversations, or send convincing phishing messages to the victims' contacts.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs

Why This Matters

A leak of 10,374 records gives criminals a large, ready-made list for credential stuffing, where stolen email and password combinations are tested automatically against other websites. Because so many people reuse passwords, a single exposed Hotmail login can cascade into account takeover, identity theft, and financial fraud on completely unrelated accounts.

How a Combolist Works

A combolist is exactly what it sounds like: a combined list of usernames or email addresses paired with their matching passwords, often labeled "UHQ" (ultra high quality) or "private" by sellers to suggest the credentials are fresh and reliable. Unlike a raw database dump, a combolist is built specifically to be plugged straight into automated login tools, which is why files like this one, with over 10,000 verified pairs, are actively bought and sold on Telegram.

Check If You Are Affected

If you have a Hotmail account, it is worth checking whether your credentials are part of this leak. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, giving you an instant answer so you can change your password before it is used against you.