Researchers Trace 918K Leaked Kimsufi Accounts to a 2015 Breach

HEROIC analysts traced a 2015 breach of Kimsufi, the budget dedicated-server provider, that exposed 918,938 accounts. The leaked data includes email addresses, usernames, IP addresses, and passwords hashed with MD5.

Why the Kimsufi Leak Is Dangerous

MD5 is widely considered broken by modern security standards, and cracking tools can process these hashes at massive scale. A decade on, most of the passwords behind this breach have likely already been recovered by attackers, turning what looks like a hashed password leak into something functionally equivalent to a plaintext one.

What Was Exposed in the Kimsufi Breach

• Email addresses
• Usernames
• IP addresses
• MD5 password hashes

Why This Matters

Server hosting accounts are valuable targets because they can control websites, email systems, and infrastructure that other services rely on. If your Kimsufi password was cracked and reused elsewhere, attackers can use it for credential stuffing against your email or other accounts, and the exposed IP addresses add another data point that can be used to build a fuller profile of you.

How This Database Breach Happened

This is classified as a database breach, meaning attackers extracted nearly a million user records directly from Kimsufi's systems. Breaches of this size tend to circulate widely on underground forums for years, getting re-indexed and resold as part of larger credential collections.

Check If You Are Affected

If you have ever used Kimsufi's hosting services, it is worth confirming whether your account was part of this leak. HEROIC's free breach scanner checks your email against more than 400 billion exposed records, including this breach, in seconds.