ViewComponent: around_render HTML-Safety Bypass

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-54498: 0.45% estimated exploitation activity in the next 30 days; percentile 39.38 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary ViewComponent::Base#aroundrender can return HTML-unsafe strings that bypass the escaping behavior applied to normal #call return values. This creates an XSS risk when downstream applications use aroundrender to wrap, replace, instrument, or conditionally return content that includes user-controlled data. The issue is especially dangerous in collection rendering because ViewComponent::Collection#renderin joins the per-item results and marks the entire output as htmlsafe, converting raw unsafe output into a trusted ActiveSupport::SafeBuffer. Affected Code Validated against: - Repository commit: eea79445 - Ruby: 3.4.9 Relevant locations: - lib/viewcomponent/base.rb - renderin - aroundrender - vcmaybeescapehtml - lib/viewcomponent/template.rb - InlineCall#safemethodnamecall - lib/viewcomponent/collection.rb - Collection#renderin Key code paths: Root Cause Normal inline #call output is passed through vcmaybeescapehtml, which escapes HTML-unsafe strings. However, when aroundrender…

Published by the source

15 Jul 2026, 22:51 UTC

Last modified by the source

15 Jul 2026, 22:51 UTC

Source last checked

26 Oct 2026, 15:52 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-97jw-64cj-jc58

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# Patch Next advisory brief: CVE-2026-54498

Advisory: ViewComponent: around_render HTML-Safety Bypass
IDs: CVE-2026-54498, GHSA-97jw-64cj-jc58
Record: https://patchnext.com/advisories/cve-2026-54498 (revision 1, source checked 26 Oct 2026, 15:52 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: view_component 4.12.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems view_component: affected >= 4.0.0, < 4.12.0; fixed in 4.12.0

## Suggested inspection (read-only)
- RubyGems view_component: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on view_component.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-97jw-64cj-jc58 (GitHub-reviewed advisory GHSA-97jw-64cj-jc58 lists affected ranges: RubyGems view_component >=4.0.0 <4.12.0)

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