CVE-2024-21636: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. Versions prior to 3.9.0 have a cross-site scripting vulnerability that has the potential to impact anyone rendering a component directly from a controller with the view_component gem. Note that only components that define a #call method (i.e. instead of using a sidecar template) are affected. The return value of the #call method is not sanitized and can include user-defined content. In addition, the return value of the #output_postamble methodis not sanitized, which can also lead to cross-site scripting issues. Versions 3.9.0 has been released and fully mitigates both the #call and the #output_postamble vulnerabilities. As a workaround, sanitize the return value of #call.