The aim of this article is to review main issues connected with the protection of a child in the cyberspace. It indicates the issue of the scientific discourse within the key terms: cyberspace and security of an underage in the online and offline environment. In the context of his position as mass media recipient and an user of cyberspace, several threats have been indicated and allocated to two basic categories: of macro-social and individual character. Premises shaping the systems of child’s security in the cyberspace have been indicated and the use of legal instruments and alternative methods in terms of specific security threats has been noted. Ultimately, current challenges to increase the effectiveness of providing security in the cyberspace for an underage were formulated.