The personal details of more than 150,000 members of dating website Muslim Match have been posted online, reports the BBC.
More than 700,000 private messages between members have also been leaked.
A message on the site's homepage said:
"We have been made aware of an alleged security breach and we are reviewing our systems as we work to remedy the situation and tighten our security."
The leaked details included sensitive information such as whether a member would consider polygamy.
The breach was discovered by security researcher Troy Hunt who runs a cybersecurity alert website.
Details of members' employers, location, marriage status and whether they were a convert to Islam were revealed, as well as names, email addresses, Skype handles and IP addresses - according to technology news site Motherboard.
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