[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f1l2vx435s65py":3},{"success":4,"breach":5},true,{"_id":6,"name":7,"title":8,"slug":7,"domain":9,"breachDate":10,"addedDate":11,"publishedAt":12,"modifiedDate":13,"contentUpdatedAt":14,"source":15,"sourceUrl":16,"sourceUrls":17,"pwnCount":18,"affectedCount":18,"affectedCountStatus":19,"affectedCountLowerBound":12,"affectedCountUnit":20,"hasEnglishDescription":4,"contentLocale":21,"availableLocales":22,"translations":24,"severity":27,"dataClasses":28,"description":31,"seoTitle":32,"seoDescription":33,"logoUrl":34,"isVerified":35,"isSensitive":35,"isSpamList":35,"isMalware":35,"company":36},"6a45ba471d29a9f4f3ce5f48","matarka","MATARKA Alleged Data Exposure","matarka.hu","2018-08-01T00:00:00.000Z","2026-07-02T01:09:26.889Z",null,"2026-09-17T16:27:41.515Z","2026-07-19T00:07:55.611Z","Third party breach","https:\u002F\u002Fheroic.com\u002Fdarkhive-breaches\u002Fmatarka-breach\u002F",[16],23470,"known","email_identifiers","en",[21,23],"tr",{"en":25,"tr":26},{"slug":7},{"slug":7},"Medium",[29,30],"Email addresses","Passwords","\u003Cp>The MATARKA data breach is a security incident dated to August 2018, examined within the context of the academic platform providing bibliographic scanning and research accounts for Hungarian scientific journals associated with the matarka.hu domain. The record was assessed in the context of Hungary, the number of affected accounts was retained at 23,470, and the data classes were limited to email addresses and password information. In external monitoring, a breach inventory entry compatible with the matarka.hu domain, the August 2018 period, and 23,470 records was seen; since there was no official academic institution announcement or widespread news verification, confirmed status was not used. This text is written to help MATARKA users assess password security, email security, and account recovery risks without magnifying unconfirmed details.\u003C\u002Fp>\u003Cp>MATARKA was considered in the context of an academic search and journal index; registration is limited to user account security and does not imply that academic content has been violated. To prevent duplicate records, the title, domain, date, number of accounts, data classes, and common spelling variations were compared. Businesses with similar names, different domain names, or other incidents seen in the same industry were not included in this record. Therefore, a MATARKA violation is only considered within the scope of the matarka.hu domain and the available user data.\u003C\u002Fp>\u003Ch2>Leaking Data Types and Risks\u003C\u002Fh2>\u003Cp>In this record, the supported data fields are kept as email addresses and password information. An email address may be sufficient for targeted phishing messages and fake password reset attempts. The risk increases even more when password information is combined with an email or username; attackers may try the same or similar password on other services. The danger persists in older breaches such as MATARKA, because users may retain passwords they used in the past for years across different accounts.\u003C\u002Fp>\u003Cul>\u003Cli>The email address in the MATARKA account may be targeted for fake notifications and support messages.\u003C\u002Fli>\u003Cli>If password information has been reused on other accounts, there arises a risk of account takeover.\u003C\u002Fli>\u003Cli>The combination of email and password poses a serious security risk, even if it is not payment data on its own.\u003C\u002Fli>\u003Cli>Since old data sets can get mixed into different lists, the risk cannot be considered completely gone over time.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\u003Cp>The verifiable scope for MATARKA includes the matarka.hu domain, the period of August 2018, and the data classes of 23,470 accounts, email addresses, and password information. Although it is compatible with open breach inventory signals, it has not been elevated to a verified status since there is no internal incident report, official notification, or regulatory announcement. This distinction is important for the user: the risk should be considered, but the full technical cause of the incident, the attack method, database structure, or initial point of exposure may not be definitively known.\u003C\u002Fp>\u003Cp>For this reason, the explanation was kept limited to the supported fields. Fields such as phone number, physical address, payment card, official ID number, private message, or transaction history were not included because they were not supported by the available record. Since the technical storage format of the password information cannot be strongly verified in every case, users should act with the safest assumption: the same password should not be used anywhere else, and the old password should be permanently abandoned.\u003C\u002Fp>\u003Ch2>User Groups at Risk\u003C\u002Fh2>\u003Cp>The primary risk group is considered to be researchers, students, library users, and people seeking academic content who have a MATARKA account. In addition, individuals who have used the same email address for a long time, have not closed old memberships, do not use a password manager, or reuse the same password across different services carry a higher risk. Even if the MATARKA account is no longer used, it is possible for the email and password pair to be tried on other services.\u003C\u002Fp>\u003Cul>\u003Cli>Users who open multiple memberships with the same email address\u003C\u002Fli>\u003Cli>People who continued using the passwords from the August 2018 period on other services\u003C\u002Fli>\u003Cli>Users who receive password reset links via email account\u003C\u002Fli>\u003Cli>People who do not regularly check their old accounts and do not monitor password reuse\u003C\u002Fli>\u003C\u002Ful>\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\u003Cp>If you have an account associated with MATARKA or matarka.hu, first identify the password that may have been used on this account and change it on all services where the same password was used. Email accounts, banking, payment, social media, cloud storage, work accounts, and shopping accounts should be prioritized. Changing lowercase letters, adding a number at the end, or similar variations are not considered secure; a completely unique and long password must be used for each service.\u003C\u002Fp>\u003Cul>\u003Cli>Set a unique and strong password for your email account.\u003C\u002Fli>\u003Cli>Enable multi-factor authentication on every account possible.\u003C\u002Fli>\u003Cli>If you have used the old password associated with MATARKA on other services, change all of them.\u003C\u002Fli>\u003Cli>Carefully examine unexpected login alerts, password reset messages, and fake support messages.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\u003Cp>For permanent protection, it is necessary to use a password manager, generate unique passwords for each account, separate email addresses according to their purpose, and regularly review old memberships. Forums, e-commerce sites, niche communities, academic services, crypto reward platforms, and local business accounts can be valuable to attackers even if forgotten; because old password habits can be used in attempts to access new accounts.\u003C\u002Fp>\u003Cp>The recommended approach specifically for MATARKA records is to close unused accounts, check session history, end password reuse, and carefully separate suspicious messages coming to the same email address. For corporate users, it is also important to ensure that employees do not use their old personal passwords in work systems. Policies that prevent password reuse, multi-factor authentication, and breach monitoring processes reduce the impact of this risk.\u003C\u002Fp>\u003Ch2>Record Control and User Action\u003C\u002Fh2>\u003Cp>Users checking the MATARKA record on LeakData.io should determine which email address is affected, which accounts were opened with this email, and which passwords have been reused in the past if they see a result. Even if the record is not in a verified status, the appearance of the email and password together is sufficient reason to take security action. The most correct step is to completely abandon the risky password and renew critical accounts on the same day.\u003C\u002Fp>\u003Cp>If new official notifications, regulatory records, or reliable independent news regarding the MATARKA data breach emerge, the scope may be reassessed. Until then, this record is kept as a carefully classified warning for users to check their old accounts and password reuse associated with matarka.hu. The aim is to make the realistic risk visible without exaggerating unresolved areas and to clarify actionable security steps.\u003C\u002Fp>","MATARKA Alleged Data Exposure (23.5 Thousand Email Identifiers)","MATARKA Alleged Data Exposure. 23.5 Thousand email identifiers are reported. Reported data: Email addresses, Passwords. Review the scope, risks, and…","\u002Fuploads\u002Flogo\u002Fmatarka.png",false,{"name":37,"sector":38,"country":39,"website":9,"websiteArchiveUrl":40,"websiteStatus":40,"websiteCheckedAt":12},"MATARKA","Scientific Journals \u002F Research","Hungary",""]