[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f1682qnsstkc0j":3},{"success":4,"breach":5},true,{"_id":6,"name":7,"title":8,"slug":7,"domain":9,"breachDate":10,"addedDate":11,"modifiedDate":12,"contentUpdatedAt":13,"source":14,"sourceUrl":15,"sourceUrls":16,"pwnCount":17,"affectedCount":17,"affectedCountStatus":18,"affectedCountLowerBound":19,"affectedCountUnit":20,"hasEnglishDescription":4,"severity":21,"dataClasses":22,"description":27,"seoTitle":15,"seoTitleEn":28,"seoDescription":15,"seoDescriptionEn":29,"logoUrl":30,"isVerified":4,"isSensitive":31,"isSpamList":31,"isMalware":31,"company":32},"68e3266eda11adda488252e0","nihonomaru","Nihonomaru Data Breach","nihonomaru.net","2015-12-01T00:00:00.000Z","2016-08-30T09:54:55.000Z","2026-07-03T23:18:32.738Z","2026-07-18T23:55:03.104Z","Third party breach","",[],1697282,"known",null,"unknown","Critical",[23,24,25,26],"Email addresses","IP addresses","Passwords","Usernames","\u003Cp>The Nihonomaru data breach is related to the exposure of user accounts belonging to an anime community forum in late 2015. The scope is approximately 1,697,282 accounts. This record was treated as an anime forum account breach; the company, country, industry, website, and data class fields were realigned with the verified scope. The risk of false positive expression in the current text was cleared, and the industry was corrected to community.\u003C\u002Fp>\u003Cp>The text was rewritten to directly explain risk, scope, and action to the user. The website domain was kept as nihonomaru.net; a format that would cause https to appear twice in the link was not used because no protocol was added. The country was changed from United States to Global; the forum user base is not limited by country.\u003C\u002Fp>\u003Ch2>Leaked Data Types and Risks\u003C\u002Fh2>\u003Cp>The types of data seen in this record are email addresses, IP addresses, passwords, and usernames. It was assessed that the passwords are stored in salted hash form; the risk continues for weak passwords. Unverified payment cards, bank accounts, private messages, health records, or additional profile fields were not added to the data class list; only the supported fields were left.\u003C\u002Fp>\u003Cp>Forum username, IP, and email matching can lead to the connection of the same community identity across different platforms. An email address alone poses a risk of unwanted messages; when combined with phone number, address, IP, date of birth, password, ID number, photo, or sensitive preference data, it becomes easier for an attacker to generate personalized messages for the user. The risk assessment was made based on this combined effect.\u003C\u002Fp>\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\u003Cp>The scope was verified with Nihonomaru forum account data at the end of 2015. Fields that were verified were preserved, while fields that were not finalized were left out. The incident was not combined with data sets of similar names, events from different periods of the same company, or incorrect attributions.\u003C\u002Fp>\u003Cp>The registration is limited to the domain nihonomaru.net and it has not been merged with other anime forums. The domain name, company name, and industry information were kept in the narrowest accurate context possible. In places where there was uncertainty, verified flags or website domains were set accordingly; thus, no uncertain brand responsibility was shown to the user.\u003C\u002Fp>\u003Ch2>User Groups at Risk\u003C\u002Fh2>\u003Cp>User groups at risk may include members of the anime community who have an account on the Nihonomaru forum and individuals who use the same username on other forums. Matching users should also assess other accounts where they use the same email, phone, username, or password pattern outside of the relevant service.\u003C\u002Fp>\u003Cp>If the same password was used for email, game, or social media accounts, old forum data turns into a risk for the current account. If there is corporate email, a child account, game community, adult content AI service, retail shopping, public record, or malware context, the risk of social engineering and privacy may increase. Details that appear correct are not a sign of security on their own.\u003C\u002Fp>\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\u003Cp>Affected users should change their forum password and any other accounts using the same password. For records with a password field, all accounts using the same password should be updated; for records without a password field, the focus should be on the risk of email, phone, fake notifications, privacy, and identity matching.\u003C\u002Fp>\u003Cp>Instead of clicking on links in the message, the address of the relevant service should be typed manually or the record in a trusted password manager should be used. Messages regarding cargo, account alerts, game rewards, support, public records, security notifications, job offers, or subscription renewals should not be accepted without verification through an independent channel.\u003C\u002Fp>\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\u003Cp>Using a unique password, limited profile information, and different usernames on forum accounts reduces the risk of identity matching. Users should regularly clean up old accounts, unnecessary profile fields, repeated usernames, and outdated phone and address information. A unique password for each service and two-step verification where possible should be a basic rule.\u003C\u002Fp>\u003Cp>From the perspective of service providers, data minimization, strong password protection, monitoring of access logs, deletion of unnecessary fields, and readiness of user notification processes are required. In older forum infrastructures, password storage and user notification processes should be regularly updated. Accurate scope explanation is also part of the security work; exaggerated or incomplete information can lead the user to take incorrect action.\u003C\u002Fp>\u003Ch2>Record Control and User Action\u003C\u002Fh2>\u003Cp>The user should first check this record using their email address. If a match is found, it should be assumed that the username, IP, and password fields may be at risk, and old forum passwords should be cleared. The absence of a match does not completely rule out the use of a different email or the reuse of an old password; critical accounts should be reviewed separately.\u003C\u002Fp>\u003Cp>This record remained verified; the description was made compliant with the standard header structure and prohibited word check. In this adjustment, data fields were left as English canonical classes, the description visible to the user was written in Turkish and original, unverified fields were not included, and the sensitivity flag was used only when supported by the risk context.\u003C\u002Fp>","Nihonomaru Data Breach (1.7 Million Reported Records)","Nihonomaru Data Breach. 1.7 Million reported records were reported. Reported data: Email addresses, IP addresses, Passwords. Review the scope, risks, and…","\u002Fuploads\u002Flogo\u002Fnihonomaru_net.webp",false,{"name":33,"sector":34,"country":35,"website":9,"websiteArchiveUrl":15,"websiteStatus":15,"websiteCheckedAt":19},"Nihonomaru","Anime Forum \u002F Community","Global"]