Treasured exhibits have reportedly been moved to safety at Florence's world-famous Uffizi Gallery following a cyberattack earlier this year.

According to a report published on Friday in the Corriere della Sera daily, the unknown perpetrators have already attempted to use the stolen data to extort money from the museum in northern Italy.

The museum – which attracts more than 5 million visitors a year – has sealed some doorways and emergency exits, the newspaper reported.

In many museums around the world, fears of break-ins have been high since the spectacular heist at the Louvre in Paris, where part of the French crown jewels were stolen in October last year.

The newspaper report suggests hackers have repeatedly managed to breach the Uffizi’s internal database since February.

In the process, they are said to have gained access not only to passwords and login details for the photo archive but also to detailed floor plans and the locations of surveillance cameras.

The Corriere della Sera report said valuable items from the treasury of the Grand Dukes of Tuscany have been moved from the Uffizi to a vault in the Banca d'Italia.

The museum on Friday confirmed the cyberattack, but said in a statement that "absolutely no passwords" have been stolen.

In a statement, the museum added that doors were shut due to fire safety regulations, while surveillance cameras were being exchanged previous to the cyberattack.

The Uffizi, which is almost 500 years old, is one of the world’s most important art collections, with a focus on Renaissance paintings and sculptures.

Its collection includes famous works by Italian artists such as Michelangelo, Raphael, Leonardo da Vinci and Sandro Botticelli, as well as by Rembrandt and Hans Holbein.

The Uffizi also comprises the Palazzo Pitti and the Boboli Gardens.