Robinhood

In November 2021, the online trading platform Robinhood suffered a data breach after a customer service representative was socially engineered. The incident exposed over 5M customer email addresses and 2M customer names. The data was provided to HIBP by a source who requested it be attributed to "Jarand Moen Romtviet".

Record: 5.0 million

Пара Па

In August 2016, the Russian gaming site known as Пара Па (or parapa.mail.ru) was hacked along with a number of other forums on the Russian mail provider, mail.ru. The vBulletin forum contained 4.9 million accounts including usernames, email addresses and passwords stored as salted MD5 hashes.

Record: 4.9 million

QuinStreet

In approximately late 2015, the maker of "performance marketing products" QuinStreet had a number of their online assets compromised. The attack impacted 28 separate sites, predominantly technology forums such as flashkit.com, codeguru.com and webdeveloper.com (view a full list of sites). QuinStreet advised that impacted users have been notified and passwords reset. The data contained details on over 4.9 million people and included email addresses, dates of birth and salted MD5 hashes.

Record: 4.9 million

Dangdang

In 2011, the Chinese e-commerce site Dangdang suffered a data breach. The incident exposed over 4.8 million unique email addresses which were subsequently traded online over the ensuing years.

Record: 4.8 million

Descomplica

In March 2021, the Brazilian EdTech company Descomplica suffered a data breach which was subsequently posted to a popular hacking forum. The data included almost 5 million email addresses, names, the first 6 and last 4 digits and the expiry date of credit cards, purchase histories and password hashes.

Record: 4.8 million

VTech

In November 2015, hackers extracted more than 4.8 million parents' and 227k children's accounts from VTech's Learning Lodge website. The Hong Kong company produces learning products for children including software sold via the compromised website. The data breach exposed extensive personal details including home addresses, security questions and answers and passwords stored as weak MD5 hashes. Furthermore, children's details including names, ages, genders and associations to their parents' reco

Record: 4.8 million

Bitcoin Security Forum Gmail Dump

In September 2014, a large dump of nearly 5M usernames and passwords was posted to a Russian Bitcoin forum. Whilst commonly reported as 5M "Gmail passwords", the dump also contained 123k yandex.ru addresses. Whilst the origin of the breach remains unclear, the breached credentials were confirmed by multiple source as correct, albeit a number of years old.

Record: 4.8 million

Vakinha

In June 2020, the Brazilian fund raising service Vakinha suffered a data breach which impacted almost 4.8 million members. The exposed data included email addresses, names, phone numbers, geographic locations and passwords stored as bcrypt hashes, all of which was subsequently shared extensively throughout online hacking communities. The data was provided to HIBP by dehashed.com.

Record: 4.8 million

Snapchat

In January 2014 just one week after Gibson Security detailed vulnerabilities in the service, Snapchat had 4.6 million usernames and phone number exposed. The attack involved brute force enumeration of a large number of phone numbers against the Snapchat API in what appears to be a response to Snapchat's assertion that such an attack was "theoretical". Consequently, the breach enabled individual usernames (which are often used across other services) to be resolved to phone numbers which users us

Record: 4.6 million

Money Bookers

Sometime in 2009, the e-wallet service known as Money Bookers suffered a data breach which exposed almost 4.5M customers. Now called Skrill, the breach was not discovered until October 2015 and included names, email addresses, home addresses and IP addresses.

Record: 4.5 million