The Tomopop Forum Leak: 6,157 Passwords Exposed. Check Yours.

HEROIC analysts found a 2015 breach of the Tomopop Forum, a community site for Japanese toy collectors, that exposed 6,157 accounts. The leaked data pairs email addresses with passwords protected using vBulletin's hashing scheme.

Why the Tomopop Forum Leak Is Dangerous

vBulletin's older hashing format has been broken by password-cracking tools for years. With this breach dating back a decade, it is likely that most of these hashes have already been converted back into plain, readable passwords by attackers who traded and cracked the data over time.

What Was Exposed in the Tomopop Forum Breach

• Email addresses
• Passwords (vBulletin hash format)

Why This Matters

A niche hobby forum might not seem like a high-value target, but the password behind that account is what matters. If you used the same password on your email or other accounts, a cracked Tomopop credential can be used to break into them through credential stuffing, an attack technique that runs stolen logins against dozens of sites automatically.

How This Database Breach Happened

This incident is classified as a database breach, meaning attackers extracted user records directly from the forum's backend rather than gathering them one by one. Forum breaches like this one often get grouped with other old leaks and passed around as combined collections, which is why the data is still surfacing years after the forum itself went offline.

Check If You Are Affected

If you ever registered on the Tomopop Forum, or any similar hobby site, it is worth checking your exposure. HEROIC's free breach scanner searches more than 400 billion leaked records, including this breach, so you can see exactly what is out there.