Inside a French Forum Database Dump: How the site1727.mutu.sivit.org Breach Exposed 28,000 Accounts

In August 2018, site1727.mutu.sivit.org, a now-defunct French community forum website, experienced a database breach that exposed 28,382 user records. The compromised data included email addresses and passwords stored using the outdated MD5 hashing algorithm. The dataset surfaced on underground forums and has since been incorporated into combolists targeting French-speaking internet users. Though the site itself no longer operates, the leaked credentials remain viable for credential stuffing attacks wherever those users recycled their passwords.

Why This Is Dangerous

Community forums often store user credentials with minimal security investment. When those forums use MD5 without salting, every password in the database becomes crackable with standard tools in hours or less. The danger compounds when the forum is no longer active: there is no operator to notify affected users, no forced password reset, and no breach disclosure. Users who registered on site1727.mutu.sivit.org years ago may have no idea their email and cracked password are being tested against their current accounts right now. The fact that this dataset was specifically described as useful for targeting French-speaking users indicates threat actors are actively segmenting it for geographicaly targeted attacks.

What Was Exposed

• Records affected: 28,382 unique user accounts
• Email addresses: Full addresses from a French-language community platform
• Password hashes: MD5 format with no salt, easily cracked
• Platform type: French community and discussion forum (now defunct)
• Country of origin: France
• Breach date: August 2018
• Distribution: Underground forums; bundled into French-targeting combolists

Why This Matters

Defunct websites represent a blind spot in the breach notification ecosystem. When an active company suffers a breach, there is at least a theoretical obligation to notify users. When a site goes dark, that accountability disappears entirely. Attackers know this and specifically seek out dormant-site datasets because the victims are unlikely to ever be warned. The site1727.mutu.sivit.org dataset exemplifies this problem: thousands of French internet users have credentials circulating in underground markets with no realistic chance of receiveing a warning through normal channels.

How Database and Combolist Breaches Work

A database breach starts when an attacker gains access to a web server or database through a vulnerability, such as SQL injection, a misconfigured file permision, or a compromised hosting account. The attacker exports the user table, which typically contains usernames, email addresses, and hashed passwords. With MD5-hashed passwords, cracking is the next step: tools like hashcat run millions of password guesses per second, matching common words, phrases, and patterns against the hashes until matches are found. The resulting email-and-password pairs are then packaged into a combolist and distributed on hacking forums, often with metadata like language or country to help other actors target their attacks efficiently.

Check If You Are Affected

HEROIC's free breach scanner checks your email address against more than 400 billion compromised records, including this dataset from site1727.mutu.sivit.org and thousands of similar forum breaches. If your email appears in any known leak, you will receive an immediate alert. Run your free scan now and find out before attackers use your credentials against you.