Rambler

In late 2016, a data dump of almost 100M accounts from Rambler, sometimes referred to as "The Russian Yahoo", was discovered being traded online. The data set provided to Have I Been Pwned included 91M unique usernames (which also form part of Rambler email addresses) and plain text passwords. According to Rambler, the data dates back to March 2014.

Record: 91.4 million

Dailymotion

In October 2016, the video sharing platform Dailymotion suffered a data breach. The attack led to the exposure of more than 85 million user accounts and included email addresses, usernames and bcrypt hashes of passwords.

Record: 85.2 million

2,844 Separate Data Breaches

In February 2018, a massive collection of almost 3,000 alleged data breaches was found online. Whilst some of the data had previously been seen in Have I Been Pwned, 2,844 of the files consisting of more than 80 million unique email addresses had not previously been seen. Each file contained both an email address and plain text password and were consequently loaded as a single "unverified" data breach.

Record: 80.1 million

JD

In 2013 (exact date unknown), the Chinese e-commerce service JD suffered a data breach that exposed 13GB of data containing 77 million unique email addresses. The data also included usernames, phone numbers and passwords stored as SHA-1 hashes. The data was provided to HIBP by a source who requested it be attributed to "white_peacock@riseup.net".

Record: 77.4 million

Nitro

In September 2020, the Nitro PDF service suffered a massive data breach which exposed over 70 million unique email addresses. The breach also exposed names, bcrypt password hashes and the titles of converted documents. The data was provided to HIBP by dehashed.com.

Record: 77.2 million

Tokopedia

In April 2020, Indonesia's largest online store Tokopedia suffered a data breach. The incident resulted in 15M rows of data being posted to a popular hacking forum. An additional 76M rows were later provided to HIBP in July 2020. In total, the data included over 71M unique email addresses alongside names, genders, birth dates and passwords stored as SHA2-384 hashes.

Record: 71.4 million

Lead Hunter

In March 2020, a massive trove of personal information referred to as "Lead Hunter" was provided to HIBP after being found left exposed on a publicly facing Elasticsearch server. The data contained 69 million unique email addresses across 110 million rows of data accompanied by additional personal information including names, phone numbers, genders and physical addresses. At the time of publishing, the breach could not be attributed to those responsible for obtaining and exposing it. The data w

Record: 68.7 million

Dropbox

In mid-2012, Dropbox suffered a data breach which exposed the stored credentials of tens of millions of their customers. In August 2016, they forced password resets for customers they believed may be at risk. A large volume of data totalling over 68 million records was subsequently traded online and included email addresses and salted hashes of passwords (half of them SHA1, half of them bcrypt).

Record: 68.6 million

You've Been Scraped

In October and November 2018, security researcher Bob Diachenko identified several unprotected MongoDB instances believed to be hosted by a data aggregator. Containing a total of over 66M records, the owner of the data couldn't be identified but it is believed to have been scraped from LinkedIn hence the title "You've Been Scraped". The exposed records included names, both work and personal email addresses, job titles and links to the individuals' LinkedIn profiles.

Record: 66.1 million

tumblr

In early 2013, tumblr suffered a data breach which resulted in the exposure of over 65 million accounts. The data was later put up for sale on a dark market website and included email addresses and passwords stored as salted SHA1 hashes.

Record: 65.5 million