If You Use Hotmail, the ‘Valid Hotmail’ Leak Should Worry You

HEROIC analysts found a small combolist named valid hotmail uploaded to a Telegram channel on April 9, 2024. The file is compact, just 298 records, but every entry pairs a Hotmail-linked email address with a plaintext password and a URL, and the file's own name confirms these logins were tested and confirmed working before being shared. Why This Is Dangerous: The word valid in the file name matters. Unlike raw, unverified lists, this batch appears to have already been checked, meaning whoever is distributing it is confident the logins still work. If your Hotmail or Outlook address is one of the 298, someone may already be able to log into your inbox. What Was Exposed: - Hotmail-linked email addresses - Plaintext passwords - URLs tied to each login Why This Matters: Access to an email account is often the master key to everything else. Attackers use a compromised inbox to reset passwords on banking, shopping, and social media accounts, making a small list like this disproportionately dangerous. Reused passwords compound the risk, turning one exposed account into many. How a Combolist Like This Works: A combolist is a simple file of email and password pairs, often tested or checked before being posted so buyers know the credentials are current. Small, pre-validated lists like valid hotmail are frequently sold or traded on Telegram in batches, since a confirmed-working login is worth more to a criminal than an unverified one. Check If You Are Affected: If you have a Hotmail or Outlook account, don't leave it to chance. Run your email through HEROIC's free breach scanner, which checks against more than 400 billion leaked records, and change your password immediately if you get a match.