Kingdee Cloud-Starry-Sky Enterprise Edition Freemarker Engine DynamicForm 4 Action.class plugin.buildMobilePopHtml special elements used in a template engine

A vulnerability was found in Kingdee Cloud-Starry-Sky Enterprise Edition 6.x/7.x/8.x/9.0. It has been rated as critical. Affected by this issue is the function plugin.buildMobilePopHtml of the file \k3\o2o\bos\webapp\action\DynamicForm 4 Action.class of the component Freemarker Engine. The manipulation leads to improper neutralization of special elements used in a template engine. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. It is recommended to upgrade the affected component. The vendor explains, that in the fixed release "Freemarker is set to 'ALLOWS_NOTHING_RESOLVER' to not parse any classes."