[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f2m7u2a4thnyzo":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":19,"affectedCount":19,"affectedCountStatus":20,"affectedCountLowerBound":21,"affectedCountUnit":22,"hasEnglishDescription":4,"severity":23,"dataClasses":24,"description":26,"seoTitle":27,"seoTitleEn":28,"seoDescription":27,"seoDescriptionEn":29,"logoUrl":30,"isVerified":4,"isSensitive":31,"isSpamList":31,"isMalware":31,"company":32},"68e3266eda11adda4882514d","coinmarketcap","CoinMarketCap Data Breach","coinmarketcap.com","2021-10-12T00:00:00.000Z","2021-10-22T20:32:53.000Z","2026-07-09T18:46:00.751Z","2026-07-18T23:47:44.845Z","Third party breach","https:\u002F\u002Fwww.coindesk.com\u002Fbusiness\u002F2021\u002F10\u002F25\u002Fover-3-million-coinmarketcap-email-addresses-leaked-to-dark-web",[15,17,18],"https:\u002F\u002Fwww.bankinfosecurity.com\u002Fcoinmarketcap-no-breach-despite-31m-email-leak-a-17789","https:\u002F\u002Fcryptobriefing.com\u002F3-million-coinmarketcap-email-addresses-have-leaked\u002F",3117548,"known",null,"unknown","Critical",[25],"Email addresses","\u003Cp>The CoinMarketCap data breach record concerns the circulation of 3,117,548 email addresses associated with the cryptocurrency market data platform online on October 12, 2021. In this incident, the verified data class consists only of email addresses. It was observed that the addresses linked to the platform overlapped with the user base, but it could not be definitively proven that the incident originated directly from CoinMarketCap servers. Therefore, when describing the record, it is necessary to convey both the real risk of the email list and the limited scope of the data together.\u003C\u002Fp>\n\u003Cp>In the crypto ecosystem, an email address alone can be highly valuable; because attackers can prepare fake exchange alerts, wallet security notifications, portfolio tracking messages, and token distribution promises targeting people interested in crypto. However, in this incident, the password, password hash, phone number, physical address, crypto wallet key, transaction history, balance, or payment information were not verified. Therefore, the record should not be presented as a breach where financial assets or account access were exposed.\u003C\u002Fp>\n\u003Ch2>Types of Leaked Data and Their Risks\u003C\u002Fh2>\n\u003Cp>The verified data type in the CoinMarketCap record is the email address. An email address can provide attackers with a strong targeting signal that the user may be interested in cryptocurrency markets. This information can be used for fake price alerts, account security notifications, portfolio links, investment opportunities, airdrop promises, or wallet verification requests. Targeting can become more effective if the user uses the same email address on exchanges, wallets, newsletters, or community accounts as on CoinMarketCap.\u003C\u002Fp>\n\u003Cp>Since this record does not contain a password, the risk of direct account takeover is not as high as in breaches that include passwords. Nevertheless, phishing attacks can be launched via the email address. Crypto-themed attacks usually operate through urgency, price movement, security warnings, or fear of missing out. If a user clicks on a fake link and enters exchange, wallet, or email account information, the real damage occurs at this next stage. Therefore, an email address leak should not be underestimated on its own.\u003C\u002Fp>\n\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\n\u003Cp>The number of verified affected accounts for this record is 3,117,548. The incident date is recorded as October 12, 2021. The data class is only email addresses. It has been stated that there are no passwords or authentication information in the data lists seen by the platform, and a server-side incident cannot be directly proven. Therefore, the explanation to be conveyed to the user should clarify that the email addresses are associated with the CoinMarketCap user base; however, it does not claim passwords, funds, or account access.\u003C\u002Fp>\n\u003Cp>In this record, cryptocurrency wallet private keys, cryptocurrency asset balances, transaction history, exchange account information, payment cards, bank accounts, phone numbers, physical addresses, or official identity documents are not considered verified data classes. The trading of email addresses poses a serious targeting risk; however, this risk does not mean that financial assets are directly compromised. The correct scope should be described as 'crypto-themed phishing and targeted messaging risk.'\u003C\u002Fp>\n\u003Ch2>User Groups at Risk\u003C\u002Fh2>\n\u003Cp>The individuals at the highest risk are those users who use the email address they use for CoinMarketCap on crypto exchanges, wallet services, portfolio tracking applications, or community platforms as well. When the same address is used on multiple crypto services, an attacker can classify this address as a crypto investor or market follower. This makes fake exchange logins, wallet verifications, token distribution, or security update messages more targeted.\u003C\u002Fp>\n\u003Cp>The second risk group consists of users who are new to the crypto space and may have difficulty distinguishing security warnings from genuine platform messages. Fake support messages, high-yield investment promises, free token campaigns, and account verification links may target this group. Corporate users should not be overlooked either; an employee registering for crypto market services with their work email may receive crypto-themed phishing messages at their work address. These messages can affect not only individual accounts but also work devices and corporate accounts.\u003C\u002Fp>\n\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\n\u003Cp>A user who notices a match on their CoinMarketCap record should first check the security of their email account. A strong and unique password should be used for the email account, multi-factor authentication should be enabled, and recent sessions should be reviewed. Multi-factor authentication should also be enabled for cryptocurrency exchange and wallet services using the same email address. Even if the password is not confirmed to be compromised in this incident, it should not be forgotten that it could be stolen through phishing links.\u003C\u002Fp>\n\u003Cp>Users should be careful with links in messages themed around CoinMarketCap, crypto exchanges, wallets, token distribution, airdrop, security alerts, or portfolio updates. If a transaction is to be made, the address of the relevant platform should be typed manually into the browser or a previously saved trusted link should be used. No actions such as linking wallets, entering recovery phrases, sharing private keys, or providing verification codes should be performed via links in emails. Legitimate services will never ask for a user's private key or recovery phrases.\u003C\u002Fp>\n\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\n\u003Cp>In the crypto field, an email address can be a signal that reveals investment interests. In the long term, users might consider using a separate email address for crypto exchanges, portfolio tracking tools, and newsletters. This address should be protected with a strong password and multi-factor authentication. Unused crypto newsletters and accounts should be closed, and unnecessary notification subscriptions should be reduced. This way, the surface for targeted messages is minimized.\u003C\u002Fp>\n\u003Cp>In a corporate environment, employees' registration on high-risk finance and crypto platforms using work emails should be restricted. Crypto-themed phishing scenarios should also be specifically addressed in security training; because these messages are usually crafted with urgent security alerts or opportunity language. Users should not share wallet recovery phrases, private keys, or verification codes through any messaging channels. Email address leaks can be controlled before causing serious damage with proper security habits.\u003C\u002Fp>\n\u003Ch2>Record Control and User Action\u003C\u002Fh2>\n\u003Cp>A match in this record indicates that the relevant email address appears on the email list associated with CoinMarketCap. A match does not mean that the user's password, crypto assets, wallet keys, or transaction history are included in the verified scope of this record. The only verified data class is the email address. Nevertheless, the risk of crypto-themed targeted messages should be considered real.\u003C\u002Fp>\n\u003Cp>After securing their email account, the user should check multi-factor authentication on crypto exchange and wallet accounts. Unexpected security alerts, airdrop promises, token sales, and messages requesting wallet connections should be verified through official channels. If the email address remains on old or unused accounts, these accounts should be closed or notifications reduced. The correct action in this case is not financial panic; it is to strengthen email security and increase vigilance against crypto-themed phishing attempts.\u003C\u002Fp>","","CoinMarketCap Data Breach (3.1 Million Reported Records)","CoinMarketCap Data Breach. 3.1 Million reported records were reported. Reported data: Email addresses. Review the scope, risks, and protective steps.","\u002Fuploads\u002Flogo\u002Fcoinmarketcap_com.webp",false,{"name":33,"sector":34,"country":35,"website":9,"websiteArchiveUrl":27,"websiteStatus":27,"websiteCheckedAt":21},"CoinMarketCap","Cryptocurrency market data platform","United States"]