Yes, terrorism is a high risk to travelers in Mozambique. Careful planning and preparation is necessary to understand the level of risk in each region. There is strong support for ISIS in the north where attacks are common. The risk is less severe in the south, however it is likely a certain level does exist. Travelers and tourists should remain cautious when moving through the region.
There is a reasonable risk of terrorism in Maputo. Terrorist groups are not assessed to be as active in the south, however, it is still possible they have the capability to cause disruption and destruction if the opportunity is presented.
Travel in Mozambique is challenging, always ensure you have the right security measures in place.