CVE-2021-39318

Name of the Vulnerable Software and Affected Versions: H5P CSS Editor WordPress plugin versions up to and including 1.0

Description: The issue allows attackers to inject arbitrary web scripts via the h5p-css-file parameter in the ~/h5p-css-editor.php file, enabling Reflected Cross-Site Scripting attacks.

Recommendations: For versions up to and including 1.0, update to a version that contains a fix for this issue to prevent Reflected Cross-Site Scripting attacks. As a temporary workaround, consider restricting access to the ~/h5p-css-editor.php file to minimize the risk of exploitation. Avoid using the h5p-css-file parameter in the affected endpoint until the issue is resolved.