In the last two years, the terrorist organization, the Mojahedin Khalq, due to its considerable territorial distance, by exploiting vulnerabilities in the cyber environment, cyber attacks on government infrastructure have emerged. It is obvious that defence against non-state actors is legal, at least in some cases. However, the emergence of new types of terrorism, such as cyber terrorism, which may suddenly endanger international peace and security, has caused international law to lag behind in establishing new rules appropriate to cyberspace. The question raised in this research is: What is the appropriate interpretation of the United Nations Charter in assessing the possibility of Iran resorting to self-defence against cyber attacks by the Mojahedin Khalq Organization, in line with exercising jurisdiction and securing vital national interests? In response to this issue, a descriptive-analytical research method using library tools has been used. Therefore, after examination, the present study concludes that the cyber attacks of the Mojahedin Khalq Organization have not yet reached the point necessary to resort to self-defence.