PowerJob Server version 5.1.2 (and likely earlier) uses a predictable JWT signing key for HS256-based authentication. This allows a remote attacker to execute arbitrary code.
https://github.com/PowerJob/PowerJob/blob/master/docker-compose.yml
https://gist.github.com/unpredictable21/39e6ce22e4bc45b0e553d0fa6a6e4d1c