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CVE-2021-39318

MEDIUM 6.1 CVSS 3.1
Published
December 14, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Description

The H5P CSS Editor WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the h5p-css-file parameter found in the ~/h5p-css-editor.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.

Affected WordPress components

  • h5p-css-editor Plugin · h5p-css-editor
    Confirmed match Homeless
    From 1.0 (including) to 1.0 (including); Up to and including 1.0
    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

  • H5P CSS Editor H5P CSS Editor — From 1.0 (including) to 1.0 (including)
  • h5p-css-editor_project h5p-css-editor — Up to and including 1.0

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/h5p-css-editor/tags/1.0/h5p-css-editor.php#L50 Third Party Advisory
  • www.wordfence.com https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39318 Third Party Advisory
  • nvd.nist.gov Official NVD record