Mathway
HIGH RISKData breach — January 2020
In January 2020, the math solving website Mathway suffered a data breach that exposed over 25M records. The data was subsequently sold on a dark web marketplace and included names, Google and Facebook IDs, email addresses and salted password hashes.
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What happened in the Mathway data breach?
In January 2020, the math solving website Mathway suffered a data breach that exposed over 25M records. The data was subsequently sold on a dark web marketplace and included names, Google and Facebook IDs, email addresses and salted password hashes.
The exposed data included 5 types of personal information. Because passwords were exposed, users who reused their password on other sites are at particular risk. Learn more about what a data breach means for you.
Quick answer — was Mathway hacked?
Yes. Mathway was breached in January 2020. The breach exposed 25,692,862 records including device information, email addresses, names. 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 Mathway breach so dangerous?
The Mathway breach exposed 25,692,862 records — that is 25.7M people whose personal data is now circulating on the dark web. The combination of device information, email addresses, names makes this a high-risk breach that requires immediate action.
Because passwords were exposed, attackers can use credential stuffing to automatically test your Mathway password against hundreds of other websites. If you reused your password anywhere, those accounts are now at risk. Read more about what happens to your data after a breach.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the Mathway breach?
Device information — may be combined with other breach data to build a profile for targeted attacks
Email addresses — used for phishing attacks and credential stuffing against your other accounts
Names — used to build profiles and target you with personalised scams
Passwords — can be used to access your accounts directly or cracked to reveal your actual password
Social media profiles — may be combined with other breach data to build a profile for targeted attacks
Is the Mathway breach still dangerous in 2026?
Yes. Stolen data from the Mathway 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 2020 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 Mathway 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 Mathway breach
Approximately 25,692,862 user records were exposed in the Mathway breach in January 2020.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your Mathway 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 Mathway dataset and tell you instantly whether your email was exposed and what data was taken.
Change your Mathway 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 Mathway breach?
The Mathway data breach affected approximately 25,692,862 users who had accounts with the service. With 25.7M records exposed, this is one of the larger breaches tracked in our database of 970+ known breaches.
If you ever created an account with Mathway 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 Mathway breach
Change your Mathway password immediately
Go to Mathway 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 Mathway 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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