CVE-2021-39318

MediumCVSS 6.1/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
H5P CSS Editor	H5P CSS Editor	>= 1.0, <= 1.0

References

https://plugins.trac.wordpress.org/browser/h5p-css-editor/tags/1.0/h5p-css-editor.php#L50Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39318Third Party Advisory
https://plugins.trac.wordpress.org/browser/h5p-css-editor/tags/1.0/h5p-css-editor.php#L50Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39318Third Party Advisory

Timeline

Published: Dec 14, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-393196.1The duoFAQ - Responsive, Flat, Simple FAQ WordPess plugin is vulnerable to Reflected Cross-Site Scripting via the msg parameter found in the CVE-2021-39324.3twill is vulnerable to Cross-Site Request Forgery (CSRF)CVE-2021-393206.1The underConstruction plugin <= 1.18 for WordPress echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file. On certain CVE-2021-393218.8Version 3.3.23 of the Sassy Social Share WordPress plugin is vulnerable to PHP Object Injection via the wp_ajax_heateor_sss_import_config AJ CVE-2021-393226.1The Easy Social Icons plugin <= 3.0.8 for WordPress echoes out the raw value of `$_SERVER['PHP_SELF']` in its main file. On certain configur CVE-2021-393256.1The OptinMonster WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to insufficient input validation in the load_previews CVE-2021-393275.3The BulletProof Security WordPress plugin is vulnerable to sensitive information disclosure due to a file path disclosure in the publicly ac CVE-2021-393284.8The Simple Job Board WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient escaping on the $job_board_privacy_po CVE-2021-393294.8The JobBoardWP WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via sever CVE-2021-39335.5An integer overflow could occur when OpenEXR processes a crafted file on systems where size_t < 64 bits. This could cause an invalid bytesPe CVE-2021-393324.8The Business Manager WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization fou CVE-2021-393338.1The Hashthemes Demo Importer Plugin <= 1.1.1 for WordPress contained several AJAX functions which relied on a nonce which was visible to all