CVE-2021-39318

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CVSS 3.1

6.1 medium

EPSS

<1%p53

Published

Dec 14, 2021 (Dec 14, 2021)

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.

Vendors: h5p-css-editor project
Products: h5p-css-editor
Ecosystems: WordPress
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.8%)

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