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CVE-2021-24153

MEDIUM 5.4 CVSS 3.1
Published
April 5, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
contact@wpscan.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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.

Affected WordPress components

  • Yoast SEO – Advanced SEO with real-time guidance and built-in AI Plugin · wordpress-seo
    Confirmed match Active
    From 3.4.1 (including) to 3.4.1 (excluding)
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Unknown Yoast SEO — From 3.4.1 (including) to 3.4.1 (excluding)
  • yoast yoast_seo — Before 3.4.1

References

  • packetstormsecurity.com https://packetstormsecurity.com/files/138192/ Exploit, Third Party Advisory, VDB Entry
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/1466243/wordpress-seo Third Party Advisory
  • wpscan.com https://wpscan.com/vulnerability/77810044-394d-4314-b9a1-20c7dca726dc Third Party Advisory
  • nvd.nist.gov Official NVD record