FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.215, the reply and draft flows trust client-supplied encrypted attachment IDs. Any IDs present in "attachments_all[]" but omitted from retained lists are decrypted and passed directly to "Attachment::deleteByIds()". Because "load_attachments" returns encrypted IDs for attachments on a visible conversation, a mailbox peer can replay those IDs through "save_draft" and delete the original attachment row and file. Version 1.8.215 fixes the vulnerability.