Security advisory

{
  "id": "6242c9993ba70a4f41e6d5324183a492e0c8c4a5c72be980b749a2d44e13c24b",
  "url": "https://osv.dev/vulnerability/CVE-2020-8264",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8264",
    "summary": "In actionpack gem >= 6.0.0, a possible XSS vulnerability exists when an application is running in development mode allowing an attacker to send or embed (in another page) a specially crafted URL which can allow the attacker to execute JavaScript in the context of the local application. This vulnerability is in the Actionable Exceptions middleware.",
    "evidence": "osv:CVE-2020-8264",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-8264",
      "aliases": [
        "CVE-2020-8264",
        "GHSA-35mm-cc6r-8fjp"
      ],
      "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",
              "type": "GIT",
              "events": [
                {
                  "introduced": "66cabeda2c46c582d19738e1318be8d59584cc5b"
                },
                {
                  "fixed": "fe76a95b0d252a2d7c25e69498b720c96b243ea2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "fixed": "6.0.3.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.0.3.3",
            "v6.0.3.2",
            "v6.0.3.1",
            "v6.0.3",
            "v6.0.3.rc1",
            "v6.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8264.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:18.485950497Z",
      "provider": "osv",
      "references": [
        "https://groups.google.com/g/rubyonrails-security/c/yQzUVfv42jk/m/oJWw-xhNAQAJ",
        "https://hackerone.com/reports/904059"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-8264",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429783,
  "published_at": "2021-01-06T21:15:14.363+00:00"
}