CoinMarketCap
MEDIUM RISKData breach — October 2021
During October 2021, 3.1 million email addresses with accounts on the cryptocurrency market capitalisation website CoinMarketCap were discovered being traded on hacking forums. Whilst the email addresses were found to correlate with CoinMarketCap accounts, it's unclear precisely how they were obtained. CoinMarketCap has provided the following statement on the data: "CoinMarketCap has become aware that batches of data have shown up online purporting to be a list of user accounts. While the data lists we have seen are only email addresses (no passwords), we have found a correlation with our subscriber base. We have not found any evidence of a data leak from our own servers — we are actively investigating this issue and will update our subscribers as soon as we have any new information."
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What happened in the CoinMarketCap data breach?
During October 2021, 3.1 million email addresses with accounts on the cryptocurrency market capitalisation website CoinMarketCap were discovered being traded on hacking forums. Whilst the email addresses were found to correlate with CoinMarketCap accounts, it's unclear precisely how they were obtained. CoinMarketCap has provided the following statement on the data: "CoinMarketCap has become aware that batches of data have shown up online purporting to be a list of user accounts. While the data lists we have seen are only email addresses (no passwords), we have found a correlation with our subscriber base. We have not found any evidence of a data leak from our own servers — we are actively investigating this issue and will update our subscribers as soon as we have any new information."
The exposed data included 1 types of personal information. Learn more about what a data breach means for you.
Quick answer — was CoinMarketCap hacked?
Yes. CoinMarketCap was breached in October 2021. The breach exposed 3,117,548 records including email addresses. This breach has been independently verified. If your email was involved, your data may still be at risk today. Check if you were affected.
Why was the CoinMarketCap breach so dangerous?
The CoinMarketCap breach exposed 3,117,548 records — that is 3.1M people whose personal data is now circulating on the dark web. The combination of email addresses makes this a medium-risk breach that should be addressed promptly.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the CoinMarketCap breach?
Email addresses — used for phishing attacks and credential stuffing against your other accounts
Is the CoinMarketCap breach still dangerous in 2026?
Yes. Stolen data from the CoinMarketCap breach remains dangerous years after the incident. Research shows that over 65% of stolen credentials from older breaches have never been changed by the account holders. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2021 are still actively used in credential stuffing attacks today.
Personal information like email addresses, phone numbers, and dates of birth never expire. Even if you changed your CoinMarketCap password, the other exposed data can be combined with information from other breaches to target you. Learn more about how long stolen data stays dangerous.
Frequently asked about the CoinMarketCap breach
Approximately 3,117,548 user records were exposed in the CoinMarketCap breach in October 2021.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your CoinMarketCap password elsewhere and haven't changed it, those accounts remain at risk today.
Enter your email in the free checker on EmailLeaked. We scan 12 billion+ breach records including the full CoinMarketCap dataset and tell you instantly whether your email was exposed and what data was taken.
Change your CoinMarketCap password immediately, change any other account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.
Who was affected by the CoinMarketCap breach?
The CoinMarketCap data breach affected approximately 3,117,548 users who had accounts with the service. While not the largest breach on record, it still represents a significant number of compromised accounts in our database of 970+ known breaches.
If you ever created an account with CoinMarketCap or used their services, your data may have been included in this breach. Check your email now to find out. You can also read our guide on what to do immediately after a data breach.
If your email was in the CoinMarketCap breach
Change your CoinMarketCap password immediately
Go to CoinMarketCap and change your password right now. Use a strong, unique password that you have never used anywhere else.
Change any account sharing that password
If you used the same password on other sites, change it on every one of them. Attackers test stolen credentials on hundreds of popular sites within hours.
Enable two-factor authentication
Turn on 2FA on CoinMarketCap and every important account. Even if your password is known, attackers cannot get in without the second factor.
Check your other accounts for this breach
Run a full email check to see every breach your email appears in — not just this one.
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