Intensive development of computer technology and technologies of distributed computing systems has resulted in the appearance of new active and interactive forms of education. Currently, students have enough opportunities of wide access to electronic educational resources. At the same time, new threats and vulnerabilities have emerged, which can be classified into 3 groups: threats associated with vulnerabilities of portal solutions and information and educational content management systems in a distributed information educational environment; threats related to the relevance, reliability and quality of content presentation; electronic educational resources copyright protection and insufficient regulatory framework for information security. The threats in a distributed information educational environment and mechanisms of information security has been performed. Copyright © 2019 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).