Medium severity6.1NVD Advisory· Published Dec 14, 2021· Updated Jun 17, 2026No known patch
CVE-2021-39318
No known patch is available for this vulnerability.
The affected plugin has been removed from the WordPress.org directory (reason: Security Issue), and no patched version is being distributed through the official directory. If you have the affected software installed, you should uninstall or replace it rather than wait for an update.
CVE-2021-39318
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.
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Affected products
2- Range: <=1.0
- H5P CSS Editor/H5P CSS Editorv5Range: 1.0
Patches
Vulnerability mechanics
References
2- plugins.trac.wordpress.org/browser/h5p-css-editor/tags/1.0/h5p-css-editor.phpnvdThird Party Advisory
- www.wordfence.com/vulnerability-advisories/nvdThird Party Advisory
News mentions
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