Security advisory

{
  "id": "13977a070e6f22302c671655fa3206ce753e470d366a92274f1950170fe1a41b",
  "url": "https://osv.dev/vulnerability/CVE-2018-3741",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-3741",
    "summary": "There is a possible XSS vulnerability in all rails-html-sanitizer gem versions below 1.0.4 for Ruby. The gem allows non-whitelisted attributes to be present in sanitized output when input with specially-crafted HTML fragments, and these attributes can lead to an XSS attack on target applications. This issue is similar to CVE-2018-8048 in Loofah. All users running an affected release should either upgrade or use one of the workarounds immediately.",
    "evidence": "osv:CVE-2018-3741",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-3741",
      "aliases": [
        "CVE-2018-3741",
        "GHSA-px3r-jm9g-c8w8"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rails/rails-html-sanitizer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "5c4354db7524b1df891df0a3e29877ce9f7575ca"
                },
                {
                  "fixed": "f3ba1a839a35f2ba7f941c15e239a1cb379d56ae"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:rubyonrails:html_sanitizer:*:*:*:*:*:ruby:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.0.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f3ba1a839a35f2ba7f941c15e239a1cb379d56ae"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-3741.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:27.814719729Z",
      "provider": "osv",
      "references": [
        "https://github.com/rails/rails-html-sanitizer/commit/f3ba1a839a35f2ba7f941c15e239a1cb379d56ae"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-3741",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 381734,
  "published_at": "2018-03-30T19:29:00.333+00:00"
}