The GEA was set up last year as part of the Vision 2030 reform program to provide entertainment options for Saudis, who are accustomed to traveling abroad to see shows and visit amusement parks in nearby Dubai and further afield.
It said on Twitter it was working to end the attacks, which began early on Thursday, to prevent any impact to its website or social media accounts.
“The source of the subversive attacks, which aim to harm the authority and its efforts, is being identified,” it added.
The GEA organized a big program of concerts and performances last weekend for the 87th anniversary of Saudi Arabia’s foundation.
The festivities included a pageant operetta which allowed women to enter a sports stadium in Riyadh for the first time and a block party where men and women danced to music in a central street - drawing some criticism in the conservative Islamic kingdom where gender segregation is strictly enforced.
Earlier this year, Saudi Arabia put out an alert about the Shamoon virus, which cripples computers by wiping their disks, as the labor ministry had been attacked and a chemicals firm reported a network disruption.