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CVE-2021-39202

MEDIUM 5.4 CVSS 3.1
Published
September 9, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security-advisories@github.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

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. In affected versions the widgets editor introduced in WordPress 5.8 beta 1 has improper handling of HTML input in the Custom HTML feature. This leads to stored XSS in the custom HTML widget. This has been patched in WordPress 5.8. It was only present during the testing/beta phase of WordPress 5.8.

Affected WordPress components

  • WordPress core
    Confirmed match
    Version 5.8

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

  • WordPress wordpress-develop — Version 5.8 beta 1
  • WordPress wordpress-develop — Version 5.8 beta 2
  • wordpress wordpress — Version 5.8

References

  • github.com https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-fr6h-3855-j297 Third Party Advisory
  • hackerone.com https://hackerone.com/reports/1222797 Permissions Required
  • nvd.nist.gov Official NVD record