Nihonomaru Data Breach
Status: Confirmed
Breach Intelligence Summary
Entity: Nihonomaru · Actor: Unknown · Source: DataBreach.com / ObscureIQ intelligence
Attack: Data Exfiltration via Vulnerability exploitation
Timeline: Breach (Dec, 2015) · Reported (Aug, 2016) · Leak (Aug, 2016)
Exposure: 1.7M+ records · Email, IP addresses, Password, Passwords, Usernames
Status: Confirmed · Risk: Moderate (Account takeover)
Summary
In December 2015 Nihonomaru an anime community website experienced a significant data breach when its vBulletin forum was hacked. This breach resulted in the exposure of approximately 1.7 million user accounts compromising sensitive information such as email addresses IP addresses usernames and salted password hashes. The attack targeted vulnerabilities within the vBulletin forum software a platform widely used for online communities. Although specific details regarding the exploitation method remain undisclosed it is evident that the attackers leveraged these security gaps to gain unauthorized access to Nihonomaru’s user database.
About Nihonomaru
Nihonomaru is the organization affected by this breach. User data may have been generated through account creation, service usage, or business operations.
If you have interacted with Nihonomaru in any capacity, your data may be included in this breach.
Threat Actor: Unknown
The threat actor responsible for this breach has not been publicly identified or confirmed at this time.
- Vulnerability exploitation
Breach Exploitation Status
Moderate
Status
Detected
Detected
Possible
Unknown
Unknown
1–3 years
Email addresses and usernames persist but credentials may rotate. Phishing risk remains elevated during this window.
Data Points Exposed
Dark Web Verification
Status: Confirmed
- Dataset containing approximately 1.7M+ records has been identified in breach intelligence sources.
- The data is indexed and searchable across breach notification platforms.
Impact
This breach carries moderate risk due to the nature of exposed data fields and the scale of affected records.
- Targeted phishing referencing Nihonomaru accounts or services
- Credential stuffing against accounts sharing the same password
- Physical mail scams and address-based identity verification fraud
- Data broker enrichment and resale
Recommendations for Impacted Individuals
If you believe your information may be included:
Non-clients may request a breach impact review.
Nihonomaru account updates
Password reset requests
Verify directly through official channels.
Email compromise is often the first pivot point.
Frequently Asked Questions
In Dec, 2015, Nihonomaru experienced a data breach that resulted in the exposure of approximately 1.7M+ records containing personal information.
The exposed data includes Email, IP addresses, Password, Passwords, Usernames.
Approximately 1.7M+ records were affected based on current breach intelligence.
Yes. This breach is treated as confirmed based on data observed in breach intelligence platforms.
Data circulation has been detected across breach-sharing channels. Downstream exploitation risk exists based on the nature of the exposed fields.
Rotate passwords associated with Nihonomaru, enable multi-factor authentication on email and financial accounts, and monitor for suspicious activity.
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Corporate Accountability
Organizations that collect personal data have a duty to implement reasonable safeguards and to notify affected individuals when breaches occur.
Scope assessments may evolve as investigations continue. Users should not rely solely on early estimates when making risk decisions.
ObscureIQ Advisory
We combine proprietary dark web access with commercial and restricted breach intelligence to verify exposure and assess real-world risk.
- A public-facing individual
- A high-profile executive
- A customer of Nihonomaru
- Or simply concerned about credential reuse
We can confirm whether your information is circulating and evaluate downstream threat vectors.