Microsoft recently mitigated a vulnerability reported by a security researcher in the Azure Container Instances (ACI) that could potentially allow a user to access other customers’ information in the ACI service. Our investigation surfaced no unauthorized access to customer data. Out of an abundance of caution we notified customers with containers running on the same clusters as the researchers via Service Health Notifications in the Azure Portal. If you did not receive a notification, no action is required with respect to this vulnerability.