{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "showdown"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1022"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-08-31T18:54:24Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "Versions of `showdown` prior to 1.9.1 are vulnerable to [Reverse Tabnabbing](https://www.owasp.org/index.php/Reverse_Tabnabbing). The package uses `target=\u0027_blank\u0027` in anchor tags, allowing attackers to access `window.opener` for the original page when opening links. This is commonly used for phishing attacks.\n\n\n## Recommendation\n\nUpgrade to version 1.9.1 or later.",
  "id": "GHSA-h6mq-3cj6-h738",
  "modified": "2021-10-01T16:12:36Z",
  "published": "2020-09-03T23:21:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/showdownjs/showdown/pull/670"
    },
    {
      "type": "WEB",
      "url": "https://github.com/showdownjs/showdown/commit/1cd281f0643ef613dc1d36847d4c6cbb22501d91"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/showdownjs/showdown"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-JS-SHOWDOWN-469487"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/1302"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Reverse Tabnabbing in showdown"
}