A method and a system of responding to a cybersecurity incident are disclosed. The method comprises: receiving incident data of at least one incident from a given computer system; analyzing the incident data of the at least one incident, including determining whether the at least one incident has been prevented before; in response to determining that the at least one incident has not been prevented yet in the given computer system, determining, based on the incident data, a threat severity of the at least one incident; and in response to the threat severity of the at least one incident exceeding a predetermined threat severity threshold, determining, based on the incident data, one or more responses to the at least one incident for responding thereto in the given computer system.