title: [20210501] - Core - Adding HTML to the executable block list of MediaHelper::canUpload
description: An issue was discovered in Joomla! 3.0.0 through 3.9.26. HTML was missing in the executable block list of MediaHelper::canUpload, leading to XSS attack vectors.
problem types: XSS
affected:
{
product: Joomla! CMS
vendor: Joomla! Project
versions:
status: affected, version: 3.0.0-3.9.26
}