Facebook CEO Mark Zuckerberg's personal cell phone number is included in the latest leak of Facebook users' personal information, a cybersecurity researcher discovered.

Several news outlets have reported on the leak, which was posted in a low-level hacking forum, Business Insider reports.

The information uploaded to the forum includes Zuckerberg's name, location, marriage details, birth date, and Facebook user ID.

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The leak, which was originally reported over the weekend, exposed the information of over 500 million Facebook worldwide.

Cyber researcher Dave Walker said Zuckerberg, as well as Facebook co-founders Chris Hughes and Dustin Moskovitz, were also among the users who had their information leaked.

Facebook calls the leak 'old data'

Insider, the first outlet to report the leak, contacted Facebook on Sunday, and a spokesperson for the company said, "this is old data that was previously reported on in 2019. We found and fixed this issue in August 2019." However, they did not comment on reports about Zuckerberg's personal information.