Ruby on Rails: Server-side template injection at ujs test server

I have found in the server code for testing ujs in Rails that template injection is possible and that leads to rce. code https://github.com/rails/rails/blob/v6.0.3.2/actionview/test/ujs/server.rb ruby module UJS class Server Blade::Assets.environment get "/" = "testsindex" match "/echo" =...