Ruby on Rails is a web application framework for building server-side apps in Ruby. It provides common web features such as routing, database access, templates, and file handling so developers can build faster with less boilerplate. That convenience is also why Rails matters in cyber security: framework defaults shape the application’s attack surface, and a weak setting or unsafe extension can affect many apps at once.
In real attacks, Rails applications are often targeted through features that process untrusted input, especially file uploads, image resizing, and automatic variant generation. If those workflows mishandle attacker-controlled content, they can lead to file disclosure, secret leakage, or in some cases code execution. Defenders should keep Rails and its components patched, minimize exposed upload paths, and treat any feature that reads or transforms user files as security-sensitive.