ruby-grape ruby gem suffers from a cross-site scripting (XSS) vulnerability via "format" parameter.
https://github.com/ruby-grape/grape/pull/1763
https://github.com/ruby-grape/grape/issues/1762
https://github.com/ruby-grape/grape/commit/6876b71efc7b03f7ce1be3f075eaa4e7e6de19af