{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.4.1"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1f22f0756e679d0b474400a6e3c248324d168bdd"
            }
          ],
          "repo": "https://github.com/yoast/wordpress-seo",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting Parenthesis as well as several functions such as alert but bypasses were found.",
  "id": "CVE-2021-24153",
  "modified": "2026-03-14T13:52:10.297647652Z",
  "published": "2021-04-05T19:15:14.560Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://plugins.trac.wordpress.org/changeset/1466243/wordpress-seo"
    },
    {
      "type": "ADVISORY",
      "url": "https://wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc"
    },
    {
      "type": "EVIDENCE",
      "url": "https://packetstormsecurity.com/files/138192/"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}