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Vulnerability record · CVE-2024-21636 · published 4 January 2024

CVE-2024-21636: Viewcomponent view component cross-site scripting vulnerability

Viewcomponent · View Component

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`.

6.1 CVSS 3.1 Medium EPSS 0.50% · top 59.9% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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`.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ViewComponent/view_component/commit/0d26944a8d2730ea40e60eae23d70684483e5017 Patch
https://github.com/ViewComponent/view_component/commit/c43d8bafa7117cbce479669a423ab266de150697 Patch
https://github.com/ViewComponent/view_component/pull/1950 ExploitIssue TrackingPatch
https://github.com/ViewComponent/view_component/pull/1962 Issue Tracking
https://github.com/ViewComponent/view_component/security/advisories/GHSA-wf2x-8w6j-qw37 Vendor Advisory
https://github.com/ViewComponent/view_component/commit/0d26944a8d2730ea40e60eae23d70684483e5017 Patch
https://github.com/ViewComponent/view_component/commit/c43d8bafa7117cbce479669a423ab266de150697 Patch
https://github.com/ViewComponent/view_component/pull/1950 ExploitIssue TrackingPatch
https://github.com/ViewComponent/view_component/pull/1962 Issue Tracking
https://github.com/ViewComponent/view_component/security/advisories/GHSA-wf2x-8w6j-qw37 Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2024-21636), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.