Interface risk is the chance of delay, misunderstanding, or dropped responsibility at the point where two or more organizations must coordinate. In cyber security, the “interface” may be a reporting channel, approval path, escalation desk, shared SOC workflow, or legal handoff between public and private teams. The risk is not usually a technical flaw in a system; it is a coordination failure.
It matters because many cyber operations depend on fast, well-defined collaboration. If one agency owns detection, another owns response, and a third must approve action, attackers can benefit from the gaps between them. Defenders see interface risk when incident reports bounce between teams, when authority is unclear, or when a new command structure adds extra layers before a decision is made. Reducing it means clarifying roles, escalation rules, and contacts before an incident starts.