30.8M accounts from Ashley Madison (ashleymadison.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesEthnicitiesGendersNamesPasswordsPayment historiesPhone numbersPhysical addressesSecurity questions and answersSexual orientationsUsernamesWebsite activity
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.
Source: Have I Been Pwned (CC BY 4.0)