291K accounts from Hookers.nl (hookers.nl) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In October 2019, the Dutch prostitution forum Hookers.nl suffered a data breach which exposed the personal information of sex workers and their customers. The IP and email addresses, usernames and either bcrypt or salted MD5 password hashes of 291k members were accessed via an unpatched vulnerability in the vBulletin forum software.
Source: Have I Been Pwned (CC BY 4.0)