[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f36uf3e8sv1r2v":3},{"success":4,"breach":5},true,{"_id":6,"name":7,"title":8,"slug":9,"domain":10,"breachDate":11,"addedDate":12,"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":25,"seoTitle":26,"seoTitleEn":27,"seoDescription":26,"seoDescriptionEn":28,"logoUrl":29,"isVerified":30,"isSensitive":30,"isSpamList":30,"isMalware":30,"company":31},"68e3266eda11adda4882514b","Cit0day","Cit0day Alleged Data Exposure","cit0day","cit0day.in","2020-11-04T00:00:00.000Z","2020-11-19T08:07:33.000Z","2026-07-18T23:47:45.596Z","Unverified breach record","https:\u002F\u002Fwww.troyhunt.com\u002Finside-the-cit0day-breach-collection\u002F",[15],226883414,"known",null,"email_identifiers","Critical",[23,24],"Email addresses","Passwords","\u003Cp>The Cit0day data breach is a large-scale data leak affecting 226,883,414 accounts linked to credential archives reported to come from more than 23,000 different websites. The incident date is considered November 4, 2020, and the addition date is November 19, 2020. The dataset contains email addresses along with password data; some passwords are in hashed form, while others are broken or in plain text. Therefore, Cit0day should be treated as a broad collection of credentials from numerous sites rather than a classic breach originating from a single company's system. The record verification level is limited; however, independent investigations have found strong indications that the data contains numerous real and previously undisclosed breaches.\u003C\u002Fp>\n\u003Ch2>Leaking Data Types and Risks\u003C\u002Fh2>\n\u003Cp>The verified data classes are email addresses and passwords. The email address is the primary identifier for attackers to find a person on different platforms and to match the same identity with other accounts. Password data, on the other hand, directly increases the risk. Even passwords stored in hashed form can be cracked over time due to weak algorithms, unsalted storage, or easily guessable password choices. Plain text passwords are directly usable for attackers. For this reason, Cit0day is a very convenient data source for account takeover attempts based on password reuse.\u003C\u002Fp>\n\u003Cp>The danger in this leak goes beyond the old account on a single service. If a user has reused the same email and password combination on forums, games, shopping sites, social media, email, or work accounts, the risk grows in a chain reaction. Attackers can try the same combination on different services, change account recovery options after successful login attempts, or target connected accounts. Additionally, the email address alone can be used for phishing messages. The presence of password data requires users to review not only the relevant old account but all accounts linked to the same password history.\u003C\u002Fp>\n\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\n\u003Cp>The verified scope is associated with 226,883,414 unique email addresses. It has been stated that the dataset consists of more than 23,000 files and site entries, with some files containing email and password hashes, some containing cracked passwords, and some containing plaintext password pairs. For this incident, the data classes are limited to email addresses and passwords. Additional fields such as full name, phone number, physical address, payment information, date of birth, or government ID have not been verified in this context. Therefore, only the verified fields are included in the description.\u003C\u002Fp>\n\u003Cp>The entry should be kept in the unverified class. The reason is not that the dataset is entirely fake; rather, there is no single clear source, no single institutional notification, or no definitive verification for each subfile. Reviews show that there are many valid signs belonging to real accounts in the archive; nonetheless, it would not be correct to assign the same level of confidence to every site and every file. This distinction is important for user safety. If the result is positive, the risk should be taken seriously, but it should not be stated with certainty for each user which specific site leaked the data.\u003C\u002Fp>\n\u003Ch2>User Groups at Risk\u003C\u002Fh2>\n\u003Cp>Users in the highest risk group are those who reuse the same password on multiple services. Collections like Cit0day allow attackers to try email and password pairs in bulk. Old forum accounts, small e-commerce sites, gaming communities, hobby platforms, and unused web memberships can often be found in such archives. If a user used a weak password on an old account and chose the same password for a more important service, a membership that seems of low importance can pose a risk to critical accounts.\u003C\u002Fp>\n\u003Cp>The second risk group consists of people who still actively use their old email address or have created many accounts with the same email address. If an email address stays the same for years, data from different breaches can be linked to a single user profile. The risk is even greater for those who use their corporate email address on personal forums or small websites; attackers can prepare targeted messages to the work account based on personal data. Users who have forgotten their old accounts are also not risk-free, because the password history remaining in these accounts can be used for new attacks.\u003C\u002Fp>\n\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\n\u003Cp>The first step is to evaluate the passwords previously used with the email address appearing as a result of Cit0day. If the same or a similar password is still used on any active account, a unique and strong password should be set immediately. Email accounts, financial accounts, social media profiles, cloud storage, work systems, and primary accounts that can access password reset links should be prioritized. Using a password manager makes it easier to generate long and unique passwords for each service. Multi-factor authentication should be enabled on all critical accounts that support it.\u003C\u002Fp>\n\u003Cp>The second step is to examine the security settings of the email account. Unknown sessions, forwarding rules, automatic filters, recovery addresses, and connected devices should be checked. Attackers may add silent forwarding rules to accounts they have accessed to maintain persistent access. Old and unused accounts should be closed or at least their passwords should be made unique. Since the user may not be able to know exactly from which site the leak occurred, they should not limit the defense to a single account; a cleanup should be performed covering all accounts that have used the same email and password in the past.\u003C\u002Fp>\n\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\n\u003Cp>Collections like Cit0day clearly show the long-term effects of password reuse. If a user used the same password on a site they considered low importance years ago, this information can later be tried against much more critical accounts. The foundation of long-term defense is unique passwords, a password manager, and multi-factor authentication. When a different password is used for each service, a leak on one site does not transfer to other accounts. The email account should also be protected, because the recovery center for other accounts is usually the email inbox.\u003C\u002Fp>\n\u003Cp>Users should review their old account inventory at regular intervals. Unused memberships should be closed, passwords should be updated for necessary accounts, and the matching risk of appearing on multiple platforms with the same username should be reduced. Organizations, on the other hand, can conduct awareness campaigns that limit employees from using their corporate email addresses in personal web memberships. Password security is not just about choosing a strong password; never reusing the same password and keeping old accounts under control is just as important.\u003C\u002Fp>\n\u003Ch2>Record Control and User Action\u003C\u002Fh2>\n\u003Cp>Checking Cit0day on LeakData helps you understand whether your email address appears in this large collection of credentials. If the result is positive, first list all the important accounts you use with the same email address. Then separate accounts using the same or similar passwords and set a unique password for each. Enable multi-factor authentication on your email account, review the login history, and remove any devices you don't recognize. Make sure that the recovery email and phone information on critical accounts belong to you.\u003C\u002Fp>\n\u003Cp>It may not be possible for most users to definitively know the single source site for this breach. Therefore, the most appropriate action is to secure your entire password history. Using a password manager, identifying old and weak passwords, separating accounts that use the same password, and closing unused memberships provide lasting protection. Do not regard the Cit0day result as an old incident; email and password pairs can be used in automated account attempts even years later. If your accounts have unique passwords and multi-factor authentication, the impact of such collections is significantly reduced.\u003C\u002Fp>","","Cit0day Alleged Data Exposure (226.9 Million Email Identifiers)","Cit0day Alleged Data Exposure. 226.9 Million email identifiers were reported. Reported data: Email addresses, Passwords. Review the scope, risks, and…","\u002Fuploads\u002Flogo\u002Fcit0day_in.webp",false,{"name":7,"sector":32,"country":33,"website":10,"websiteArchiveUrl":26,"websiteStatus":26,"websiteCheckedAt":19},"Credential collection and breach index","Global"]