The bug in the website’s photo reporting tool – which Facebook says was only temporary and has now been fixed – meant that users could access others’ pictures even if they were private.
Users were able to look at the private photos by “reporting” a profile picture as “inappropriate”, which then saw other photos displayed, such as those of Zuckerberg, the Daily Mail reported.
A Facebook spokesman told CNET, a tech media website, that the glitch happened because of “one of our most recent code pushes” but it was only live for a short time and “not all content was accessible”.
The glitch and resulting private photos of Zuckerberg went viral when software engineer Mike Rundle, of Raleigh, North Carolina, posted a link to them on photo-sharing website Imgur.
Zuckerberg’s girlfriend Priscilla Chan is pictured in most of the photos. Some of them can be viewed publicly on his public Facebook profile, but others are said to be private.
The 27-year-old technology genius, of Palo Alto, California, has a staggering fortune of $17.5 billion and treated himself to a $7 million five-bedroom, five bathroom home earlier this year in May.
The New York dentist’s son has lived in Palo Alto almost continuously since he moved Facebook to Silicon Valley straight from his Harvard dormitory room in 2004.