The Risk score is a crucial element in vulnerability management reporting as it helps in determining the urgency of remediation actions by assessing the potential impact and exploitability of the vulnerability. A higher risk score would typically prioritize the vulnerability for immediate action. Mitigation is rather an action taken to reduce the risk, not the measure of urgency. Affected hosts help in identifying where the vulnerability exists but do not directly indicate the urgency. Recurrence indicates whether a vulnerability has appeared before, which is an essential aspect of long-term vulnerability management but doesn't immediately reflect the urgency of action.