CVE-2024-21636: Viewcomponent View Component

Medium severity, CVSS 6.1. EPSS: 0.5% chance of exploitation in the next 30 days.

view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. Versions prior to 3.9.0 and 2.83.0 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 and 2.83.0 have been released and fully mitigate both the `#call` and the `#output_postamble` vulnerabilities. As a workaround, sanitize the return value of `#call`.

Affected products

• Viewcomponent View Component: before 2.83.0 (fixed in 2.83.0); from 3.0.0, before 3.9.0 (fixed in 3.9.0)

Published 2024-01-04. Last modified 2026-06-17.