The adultery website Ashley Madison said Monday that customers' data had been stolen by hackers and said the breach had been fixed, though media reports said users' information had been briefly posted online.
Avid Life Media, which owns Ashley Madison, said an "unauthorized party" was able to gain access to the data through various unauthorized points on the website.
"At this time, we have been able to secure our sites, and close the unauthorized access points," Avid Life Media said in a statement.
"We apologize for this unprovoked and criminal intrusion into our customers' information."
The technology blog Gizmodo reported that the hackers, who called themselves "The Impact Team," had briefly posted some sensitive data online before it was taken down.
Ashley Madison, which boasts more than 37 million users, helps people who are in relationships cheat on their partners.
It said it has "stringent security measures in place, including working with leading IT vendors from around the world."
"These security measures have unfortunately not prevented this attack to our system," Avid Life added.
Users in more than 46 countries subscribe to the cheating website, which was founded in 2001.
The Canada-based company said a new user joins every six seconds, and that it is "the world's largest website for married men and women looking to have a discreet affair."
Its slogan is "Life is short. Have an affair."
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