An issue was discovered in Joomla! before 3.9.16. The lack of type casting of a variable in a SQL statement leads to a SQL injection vulnerability in the Featured Articles frontend menutype.
An issue was discovered in Joomla! before 3.9.6. The debug views of com_users do not properly escape user supplied data, which leads to a potential XSS attack vector.
jQuery before 3.4.0, as used in Drupal, Backdrop CMS, and other products, mishandles jQuery.extend(true, {}, ...) because of Object.prototype pollution. If an unsanitized source object contained an enumerable __proto__ property, it could extend the native Object.prototype.
An issue was discovered in Joomla! before 3.9.5. The Media Manager component does not properly sanitize the folder parameter, allowing attackers to act outside the media manager root directory.