Improper Input Validation
Plataformatec Simple Form version prior to 5.0.0 has Incorrect Access Control in file_method? in "lib/simple_form/form_builder.rb", because a user-supplied string is invoked as a method call.
CWE-20 - Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.