In Apache Airflow 1.8.2 and earlier, an experimental Airflow feature displayed authenticated cookies, as well as passwords to databases used by Airflow. An attacker who has limited access to airflow, weather it be via XSS or by leaving a machine unlocked can exfil all credentials from the system.
In Apache Airflow 1.8.2 and earlier, a CSRF vulnerability allowed for a remote command injection on a default install of Airflow.
In Apache Airflow 1.8.2 and earlier, an authenticated user can execute code remotely on the Airflow webserver by creating a special object.