ZOHO ManageEngine M365 Manager Plus is an extensive Microsoft 365 tool from ZOHO, Inc. It is used to report, manage, monitor, audit and create alerts for critical activities.A file upload vulnerability exists in versions prior to ZOHO ManageEngine M365 Manager Plus 4421, which stems from the lack of effective filtering and restriction of file uploads in the software, and can be exploited by attackers to remotely execute code by uploading specially crafted files.