fieldtrial is pre-1.0. Security fixes go into the latest release only.
Please report vulnerabilities privately through GitHub's private vulnerability reporting. Don't open a public issue for a security problem.
Include what you found, how to reproduce it, and the fieldtrial version. You can expect an acknowledgement within a week. Fixes are announced in the changelog and in a GitHub security advisory.
The operator console (fieldtrial serve, coming in 0.1.0) is designed for a trusted local
network. In LAN mode it will require a random access token on every request. It is not meant
to be exposed to the public internet.