Every public data breach

44 disclosed this week · 26,355 on record

ShareThis

Disclosed Feb 28, 201940,960,499 accountsConfirmed

Official notice

In July 2018, the social bookmarking and sharing service ShareThis suffered a data breach . The incident exposed 41 million unique email addresses alongside names and in some cases, dates of birth and password hashes. In 2019, the data appeared listed for sale on a dark web marketplace (along with several other large breaches) and subsequently began circulating more broadly. The data was provided to HIBP by dehashed.com .

What is known

People affected40,960,499 (accounts in the leaked data, per Have I Been Pwned)
DisclosedFeb 28, 2019
DiscoveredFeb 11, 2019
HappenedJul 9, 2018
AttackNot stated
Data exposedDates of birthEmailsNamesPasswords
SectorTech · US
StatusConfirmed
Check your emailHave I Been Pwned

Sources

Notices filed

History of this record
discovered2026-09-25
empty to 2019-02-11by backfillSource
hibp2026-09-25
empty to ShareThisby backfillSource
sector2026-09-25
other to techby backfillSource
data_types2026-09-25
[] to ["dob","emails","names","passwords"]by backfillSource
records_basis2026-09-25
empty to hibpby backfillSource
records2026-09-25
empty to 40960499by backfillSource
occurred2026-09-25
empty to 2018-07-09by backfillSource
summary2026-09-25
empty to In July 2018, the social bookmarking and sharing service ShareThis suffered a data breach . The incident exposed 41 million unique email addresses alongside names and in some cases, dates of birth and password hashes. In 2019, the data appeby 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.

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