Personal data of user profiles on a popular dating site can be vulnerable after a possible cyber attack.

Adult FriendFinder – which has around 63 million users worldwide – has launched an investigation into a “potential data security incident,” the company said on Friday. The site could not confirm the number of affected accounts, but said it was temporarily disabling features, including search functions, for potentially compromised protected accounts.

“Protecting our members’ information is our top priority and we will continue to take appropriate measures necessary to protect our members and their information,” the company said in a statement.

British Channel 4 First reported that Adult FriendFinder was hacked on Thursday. About 4 million users had information disclosed in connection with the breach, the network reported.

Some users had sexual preferences, dates of birth or email addresses leaked in the hack, according to the report. The hacker posted the details to a forum.

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Criminals could potentially use the exposed data to find blackmail targets, cybersecurity experts told the TV station. A user has received apparent spam emails since the data was released.

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