This article substantiates the relevance of the research problem, which consists in the need to solve state tasks in the field of ensuring cybersecurity of social substructures of society, which is the education system. The current legal framework of the problem under study is in urgent need of improvement and development in projection on the educational environment of the school. This is due to the clearly insufficient awareness of its subjects in matters of cybersecurity, cyber defense and cyber ethics. This is confirmed not only by the empirical observations of the authors of this article, but also by the practical lack of clear pedagogical measures of cybersecurity of the school environment. The purpose of the study is to reveal the specifics of cybersecurity of the school environment. To achieve this goal, the authors of the article interpret the concept of cybersecurity in the context of the environmental approach in education, perceived as a methodology of scientific and pedagogical research. Based on these methodological positions, the authors of the article propose a detailed system of parameters and criteria for the examination of cybersecurity of the school environment. The developed system of parameters and criteria for the examination of cybersecurity of the school environment acts not only as a measuring tool, but also as a pedagogical mechanism for the formation of such an environment. Further prospects of the research are connected with the discussion in the scientific and professional audience of the modified methodology of the cybersecurity examination of the school environment proposed by us, its approbation in the real educational process and refinement taking into account the opinions of scientists and teachers. Keywords: cybersecurity, cybersafety, school educational environment, expertise, system of parameters and criteria of expertise.