Information technologies are entering the life of modern society by leaps and bounds, sometimes radically changing its image. The influence of information technologies on changing the cultural and spiritual space of many countries is perceptible too. A new phenomenon of modern culture has gone into society – the virtual museum, which has faced completely new problems that real museums have not experienced before. These problems are associated with ensuring the cyber security of virtual museums. The article discusses the features of virtual museums, their advantages and disadvantages compared with real ones. Special attention is given to the information security of virtual museums. The author has found a large number of research and publications deals with virtual museums. However, they practically do not touch on issues related to the cyber security of the object under study. Threats of virtual museums and attacks against ones are analyzed in the article. Security variants against threats are offered.