TI-2024-14361 Aliases CVE-2024-21636 GHSA-wf2x-8w6j-qw37

view_component Cross-site Scripting vulnerability

LOW 28CWE-79Published 2024-01-04 · Updated 2025-06-17

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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`.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00495 42nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed view_component (ViewComponent): 3.9.0, 2.83.0view_component (RubyGems): 3.9.0, 2.83.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ViewComponent	view_component	3.0.0 to before 3.9.0; before 2.83.0	3.9.0, 2.83.0	Patch available	CNA
—	view_component (RubyGems)	3.0.0 to before 3.9.0	3.9.0	Patch available	GHSA-wf2x-8w6j-qw37
—	view_component (RubyGems)	before 2.83.0	2.83.0	Patch available	GHSA-wf2x-8w6j-qw37

view_component VendorViewComponent Affected 3.0.0 to before 3.9.0; before 2.83.0 Fixed in 3.9.0, 2.83.0 Patch available CNA
view_component (RubyGems) Vendor— Affected 3.0.0 to before 3.9.0 Fixed in 3.9.0 Patch available GHSA-wf2x-8w6j-qw37
view_component (RubyGems) Vendor— Affected before 2.83.0 Fixed in 2.83.0 Patch available GHSA-wf2x-8w6j-qw37

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:viewcomponent:view_component::::::ruby::*	before 2.83.0; 3.0.0 to before 3.9.0	Vulnerable	ViewComponent

cpe:2.3:a:viewcomponent:view_component:*:*:*:*:*:ruby:*:* Versions before 2.83.0; 3.0.0 to before 3.9.0 Vulnerable ·ViewComponent

Remediation

Fix · CNA view_component (ViewComponent) Fixed in 3.9.0, 2.83.0
Fix · GHSA-wf2x-8w6j-qw37 view_component (RubyGems) Fixed in 3.9.0 Advisory →
Fix · GHSA-wf2x-8w6j-qw37 view_component (RubyGems) Fixed in 2.83.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2024-21636
2026-10-03 Alias added: GHSA-wf2x-8w6j-qw37

References

Exploit 1

https://github.com/ViewComponent/view_component/pull/1950

Patch 2

Advisory 2

Other 3

TI-2026-39344 view_component: around_render HTML-Safety Bypass CVSS 3.1HIGH 8.7
TI-2026-32717 view_component: System Test Entry Point Path Check Allows Sibling Directory Escape CVSS 3.1HIGH 7.5
TI-2026-39343 view_component: Reused Component Instances Retain Stale Render Context CVSS 3.1MEDIUM 6.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences