Possible XSS vulnerability with certain configurations of rails-html-sanitizer

Exploitation

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

CVSS

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

EPSS

• CVE-2022-23520: 1.19% estimated exploitation activity in the next 30 days; percentile 67.87 (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 There is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer. This is due to an incomplete fix of CVE-2022-32209. - Versions affected: ALL - Not affected: NONE - Fixed versions: 1.4.4 Impact A possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer's allowed tags to allow both "select" and "style" elements. Code is only impacted if allowed tags are being overridden using either of the following two mechanisms: 1. Using the Rails configuration config.actionview.sanitizedallowtags=: (see https://guides.rubyonrails.org/configuring.html#configuring-action-view) 2. Using the class method Rails::Html::SafeListSanitizer.allowedtags=: All users overriding the allowed tags by either of the above mechanisms to include both "select" and "style" should either upgrade or use one of the workarounds immediately. NOTE: Code is not impacted…

Published by the source

13 Dec 2022, 17:51 UTC

Last modified by the source

4 Nov 2025, 16:42 UTC

Source last checked

26 Oct 2026, 15:51 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-rrfc-7g8p-99q8

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# Patch Next advisory brief: CVE-2022-23520

Advisory: Possible XSS vulnerability with certain configurations of rails-html-sanitizer
IDs: CVE-2022-23520, GHSA-rrfc-7g8p-99q8
Record: https://patchnext.com/advisories/cve-2022-23520 (revision 1, source checked 26 Oct 2026, 15:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: rails-html-sanitizer 1.4.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems rails-html-sanitizer: affected < 1.4.4; fixed in 1.4.4

## Suggested inspection (read-only)
- RubyGems rails-html-sanitizer: 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 rails-html-sanitizer.
- 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-rrfc-7g8p-99q8 (GitHub-reviewed advisory GHSA-rrfc-7g8p-99q8 lists affected ranges: RubyGems rails-html-sanitizer >=0 <1.4.4)

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