A vulnerability was found in Nextcloud Richdocuments up to 3.8.3/4.2.0 (Cloud Software) and classified as critical. This issue affects an unknown part of the component File Drop Handler. Upgrading to version 3.8.4 or 4.2.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.