Impact & Downstream Threats
This breach carries high risk due to the nature of exposed data fields and the scale of affected records.
- Credential stuffing against reused passwords across other platforms
- Targeted phishing campaigns using exposed email addresses
Breach Intelligence
Executive Summary
In March 2017, Dueling Network—a once-popular online platform for Yu-Gi-Oh fans—suffered a significant data breach that compromised roughly 6.48 million user accounts. Although the main site had been taken offline in 2016 due to a cease-and-desist order, its forum remained active, leaving a trove of user data exposed. Hackers exploited a vulnerability in MySQL to gain unauthorized access to the database, which stored email addresses, IP addresses, usernames, and passwords hashed using the weak MD5 algorithm. This outdated hashing method made it easier for attackers to potentially crack the passwords, putting users at risk if they reused those credentials elsewhere.,
About Dueling Network
Dueling Network is an organization whose data was exposed in this breach. The dataset has been verified by ObscureIQ intelligence and indexed across breach notification platforms.
Data Points Exposed
Dark Web Verification
Status: Confirmed
- Dataset containing approximately 6.5M records identified in breach intelligence sources.
- The data is indexed and searchable across breach notification platforms.
Recommended Actions
⚠️ Do not assume this is low sensitivity.
Non-clients may request a breach impact review.
Frequently Asked Questions
In March 2017, Dueling Network experienced a data breach that exposed approximately 6.5M records containing personal information.
The exposed data includes fields such as email address, ip address, password, username.
Approximately 6.5M records were affected based on current breach intelligence.
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- A public-facing individual
- A high-profile executive
- A customer of Dueling Network
- Or concerned about credential reuse
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