Mathway

Disclosed May 22, 202025,692,862 accountsConfirmed

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.

What is known

People affected	25,692,862 (accounts in the leaked data, per Have I Been Pwned)
Disclosed	May 22, 2020
Discovered	May 15, 2020
Happened	Jan 13, 2020
Attack	Hacking
Data exposed	NamesEmailsPasswords
Sector	Tech · US
Status	Confirmed
Check your email	Have I Been Pwned

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Mathway

Official noticeatg.wa.gov

Washington Attorney General breach notice: Mathway

Official noticeattorneygeneral.delaware.gov

Notice letter filed with the Delaware DOJ: Mathway

Official noticejustice.oregon.gov

Oregon DOJ breach notice: Mathway

Aggregatorhaveibeenpwned.com

Have I Been Pwned: Mathway

Notices filed

Residents of CAMay 22, 2020

California AGCount not stated

Residents of WAMay 22, 2020

Washington AGCount not stated

Residents of DEMay 22, 2020

Delaware DOJCount not stated

Residents of ORMay 22, 2020

Oregon DOJCount not stated

Accounts in the dataJun 5, 2020

Have I Been Pwned25,692,862 people

History of this record

hibp2026-09-25

empty to Mathwayby backfillSource

sector2026-09-25

other to techby backfillSource

data_types2026-09-25

["names"] to ["names","emails","passwords"]by backfillSource

records_basis2026-09-25

empty to hibpby backfillSource

records2026-09-25

empty to 25692862by backfillSource

occurred2026-09-25

empty to 2020-01-13by backfillSource

summary2026-09-25

empty to 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 passwoby backfillSource

data_types2026-09-25

[] to ["names"]by backfillSource

attack2026-09-25

unknown to hackingby backfillSource

discovered2026-09-25

empty to 2020-05-15by backfillSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about Mathway