GHSA-9H9G-93GC-623H

Vulnerability from github – Published: 2022-12-13 17:50 – Updated: 2025-11-04 16:41
VLAI?
Summary
Possible XSS vulnerability with certain configurations of rails-html-sanitizer
Details

Summary

There is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer.

  • 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 in either of the following ways:

  • allow both "math" and "style" elements,
  • or allow both "svg" and "style" elements

Code is only impacted if allowed tags are being overridden. Applications may be doing this in four different ways:

  1. using application configuration:

ruby # In config/application.rb config.action_view.sanitized_allowed_tags = ["math", "style"] # or config.action_view.sanitized_allowed_tags = ["svg", "style"]

see https://guides.rubyonrails.org/configuring.html#configuring-action-view

  1. using a :tags option to the Action View helper sanitize:

<%= sanitize @comment.body, tags: ["math", "style"] %> <%# or %> <%= sanitize @comment.body, tags: ["svg", "style"] %>

see https://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html#method-i-sanitize

  1. using Rails::Html::SafeListSanitizer class method allowed_tags=:

ruby # class-level option Rails::Html::SafeListSanitizer.allowed_tags = ["math", "style"] # or Rails::Html::SafeListSanitizer.allowed_tags = ["svg", "style"]

  1. using a :tags options to the Rails::Html::SafeListSanitizer instance method sanitize:

ruby # instance-level option Rails::Html::SafeListSanitizer.new.sanitize(@article.body, tags: ["math", "style"]) # or Rails::Html::SafeListSanitizer.new.sanitize(@article.body, tags: ["svg", "style"])

All users overriding the allowed tags by any of the above mechanisms to include (("math" or "svg") and "style") should either upgrade or use one of the workarounds immediately.

Workarounds

Remove "style" from the overridden allowed tags, or remove "math" and "svg" from the overridden allowed tags.

References

Credit

This vulnerability was responsibly reported by Dominic Breuker.

Severity ?
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rails-html-sanitizer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-23519"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-12-13T17:50:25Z",
    "nvd_published_at": "2022-12-14T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThere is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer.\n\n- Versions affected: ALL\n- Not affected: NONE\n- Fixed versions: 1.4.4\n\n\n## Impact\n\nA 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\u0027s allowed tags in either of the following ways:\n\n- allow both \"math\" and \"style\" elements,\n- or allow both \"svg\" and \"style\" elements\n\nCode is only impacted if allowed tags are being overridden. Applications may be doing this in four different ways:\n\n1. using application configuration:\n\n  ```ruby\n  # In config/application.rb\n  config.action_view.sanitized_allowed_tags = [\"math\", \"style\"]\n  # or\n  config.action_view.sanitized_allowed_tags = [\"svg\", \"style\"]\n  ```\n\n  see https://guides.rubyonrails.org/configuring.html#configuring-action-view\n\n2. using a `:tags` option to the Action View helper `sanitize`:\n\n  ```\n  \u003c%= sanitize @comment.body, tags: [\"math\", \"style\"] %\u003e\n  \u003c%# or %\u003e\n  \u003c%= sanitize @comment.body, tags: [\"svg\", \"style\"] %\u003e\n  ```\n\n  see https://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html#method-i-sanitize\n\n3. using Rails::Html::SafeListSanitizer class method `allowed_tags=`:\n\n  ```ruby\n  # class-level option\n  Rails::Html::SafeListSanitizer.allowed_tags = [\"math\", \"style\"]\n  # or\n  Rails::Html::SafeListSanitizer.allowed_tags = [\"svg\", \"style\"]\n  ```\n\n4. using a `:tags` options to the Rails::Html::SafeListSanitizer instance method `sanitize`:\n\n  ```ruby\n  # instance-level option\n  Rails::Html::SafeListSanitizer.new.sanitize(@article.body, tags: [\"math\", \"style\"])\n  # or\n  Rails::Html::SafeListSanitizer.new.sanitize(@article.body, tags: [\"svg\", \"style\"])\n  ```\n\nAll users overriding the allowed tags by any of the above mechanisms to include ((\"math\" or \"svg\") and \"style\") should either upgrade or use one of the workarounds immediately.\n\n\n## Workarounds\n\nRemove \"style\" from the overridden allowed tags, or remove \"math\" and \"svg\" from the overridden allowed tags.\n\n\n## References\n\n- [CWE - CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) (4.9)](https://cwe.mitre.org/data/definitions/79.html)\n- https://hackerone.com/reports/1656627\n\n\n## Credit\n\nThis vulnerability was responsibly reported by Dominic Breuker.",
  "id": "GHSA-9h9g-93gc-623h",
  "modified": "2025-11-04T16:41:59Z",
  "published": "2022-12-13T17:50:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-9h9g-93gc-623h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-23519"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/1656627"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rails/rails-html-sanitizer"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rails-html-sanitizer/CVE-2022-23519.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/09/msg00012.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00045.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Possible XSS vulnerability with certain configurations of rails-html-sanitizer"
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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