953 Hotmail Users Targeted in the 1k Hotmail Valid Combolist Leak

HEROIC analysts identified a combolist called 1k Hotmail Valid, uploaded to a Telegram channel on December 2, 2025. Despite the "1k" in its name, the file contains 953 verified records, each pairing a Hotmail email address with a plaintext password and the URL where that login was confirmed to work.

Why This Is Dangerous

Every credential in this list has already been checked and marked "valid," meaning the attacker distributing it knows the logins work before anyone else even opens the file. Because the passwords are in plaintext, there is no cracking step standing between a criminal and full access to these Hotmail inboxes.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated URLs

Why This Matters

Hotmail and other webmail accounts are often the recovery email tied to banking, shopping, and social media logins. If someone gets into your inbox, they can request password resets across your other accounts, opening the door to account takeover, financial fraud, and identity theft, often without you noticing until it is too late.

How Combolists Work

A combolist is a curated file of username or email and password pairs, usually collected from stealer logs or older breaches and then tested against the target service before being sold or shared. The "valid" label on 1k Hotmail Valid means the credentials were confirmed to log in successfully, which makes this particular list more immediately dangerous than an unverified dump of the same size.

Check If You Are Affected

With 953 verified Hotmail logins now circulating, checking your own exposure only takes a moment. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including combolists like 1k Hotmail Valid, to tell you instantly if your email shows up. If it does, change that password everywhere you have reused it and enable multi-factor authentication on your inbox right away.