piZap

In approximately December 2017, the online photo editing site piZap suffered a data breach. The data was later placed up for sale on a dark web marketplace along with a collection of other data breaches in February 2019. A total of 42 million unique email addresses were included in the breach alongside names, genders and links to Facebook profiles when the social media platform was used to authenticate to piZap. When accounts were created directly on piZap without using Facebook for authenticat

Record: 41.8 million

ShareThis

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.

Record: 41.0 million

Fling

In 2011, the self-proclaimed "World's Best Adult Social Network" website known as Fling was hacked and more than 40 million accounts obtained by the attacker. The breached data included highly sensitive personal attributes such as sexual orientation and sexual interests as well as email addresses and passwords stored in plain text.

Record: 40.8 million

Chegg

In April 2018, the textbook rental service Chegg suffered a data breach that impacted 40 million subscribers. The exposed data included email addresses, usernames, names and passwords stored as unsalted MD5 hashes. The data was provided to HIBP by a source who requested it be attributed to "JimScott.Sec@protonmail.com".

Record: 39.7 million

SHEIN

In June 2018, online fashion retailer SHEIN suffered a data breach. The company discovered the breach 2 months later in August then disclosed the incident another month after that. A total of 39 million unique email addresses were found in the breach alongside MD5 password hashes. The data was provided to HIBP by a source who requested it be attributed to "JimScott.Sec@protonmail.com".

Record: 39.1 million

Last.fm

In March 2012, the music website Last.fm was hacked and 43 million user accounts were exposed. Whilst Last.fm knew of an incident back in 2012, the scale of the hack was not known until the data was released publicly in September 2016. The breach included 37 million unique email addresses, usernames and passwords stored as unsalted MD5 hashes.

Record: 37.2 million

Poshmark

In mid-2018, social commerce marketplace Poshmark suffered a data breach that exposed 36M user accounts. The compromised data included email addresses, names, usernames, genders, locations and passwords stored as bcrypt hashes. The data was provided to HIBP by a source who requested it be attributed to "JimScott.Sec@protonmail.com".

Record: 36.4 million

NetProspex

In 2016, a list of over 33 million individuals in corporate America sourced from Dun & Bradstreet's NetProspex service was leaked online. D&B believe the targeted marketing data was lost by a customer who purchased it from them. It contained extensive personal and corporate information including names, email addresses, job titles and general information about the employer.

Record: 33.7 million

SC Daily Phone Spam List

In early 2015, a spam list known as SC Daily Phone emerged containing almost 33M identities. The data includes personal attributes such as names, physical and IP addresses, genders, birth dates and phone numbers. Read more about spam lists in HIBP.

Record: 32.9 million

Ashley Madison

In July 2015, the infidelity website Ashley Madison suffered a serious data breach. The attackers threatened Ashley Madison with the full disclosure of the breach unless the service was shut down. One month later, the database was dumped including more than 30M unique email addresses. This breach has been classed as "sensitive" and is not publicly searchable, although individuals may discover if they've been impacted by registering for notifications. Read about this approach in detail.

Record: 30.8 million