The Drag and Drop Multiple File Upload for Contact Form 7 plugin suffers from a vulnerability that lacks proper access control in the dnd_codedropz_upload_delete() function. This issue arises because the function does not verify the ownership of files, enabling unauthorized users to perform delete actions on any uploaded file. When the plugin setting 'Send attachments as links' is enabled, attackers can exploit this flaw to delete arbitrary files uploaded through the Contact Form 7 interface. This can result in loss of critical files or disruption of service. The weakness is particularly concerning for sites that heavily rely on file uploads for normal operations and have this setting enabled.

To mitigate this vulnerability, site administrators should disable the 'Send attachments as links' setting until a fix is applied. It is also recommended to enforce stringent access controls around file management functionalities and limit file upload permissions to authenticated and trusted users only.