{"id":"CVE-2021-24153","aliases":["EUVD-2021-11067","GHSA-qj4c-xvxc-5hqj"],"status":"published","title":"Yoast SEO \u003c 3.4.1 - Authenticated Stored Cross-Site Scripting (XSS)","description":"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.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01115,"percentile":0.66331,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-04-05T18:27:42Z","modified":"2026-10-24T10:30:49Z","products":[{"vendor":"unknown","product":"yoast seo"},{"vendor":"yoast","product":"yoast seo"},{"vendor":"yoast","product":"yoast_seo"}],"references":[{"url":"https://wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://plugins.trac.wordpress.org/changeset/1466243/wordpress-seo","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://packetstormsecurity.com/files/138192/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-24153"},{"url":"https://github.com/advisories/GHSA-qj4c-xvxc-5hqj"}],"sources":{"cve":[{"id":"CVE-2021-24153","title":"Yoast SEO \u003c 3.4.1 - Authenticated Stored Cross-Site Scripting (XSS)","description":"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.","status":"published","published":"2021-04-05T18:27:42Z","modified":"2024-08-03T19:21:18.41Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:04.679189Z"}],"euvd":[{"id":"EUVD-2021-11067","description":"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.","status":"published","published":"2021-04-05T18:27:42Z","modified":"2024-08-03T19:21:18Z","updated_at":"2026-11-03T03:24:59.071017Z"}],"ghsa":[{"id":"GHSA-qj4c-xvxc-5hqj","title":"A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin...","description":"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.","status":"published","published":"2022-05-24T17:46:30Z","modified":"2023-01-29T05:05:51Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:45:53.730969Z"}],"nvd":[{"id":"CVE-2021-24153","description":"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.","status":"published","published":"2021-04-05T19:15:14.56Z","modified":"2026-06-17T03:39:29.04Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:51.197859Z"}],"osv":[{"id":"CVE-2021-24153","description":"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.","status":"published","published":"2021-04-05T19:15:14.56Z","modified":"2026-10-24T10:30:49.871349946Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.778776Z"}]}}