Oracle has released VirtualBox 5.2 Maintenance Release 20.
Oracle VM VirtualBox 5.2.20 release includes improvements and regression fixes for Oracle VM VirtualBox 5.2.
Between them we can mention:
Storage: fixed connections to specific iSCSI targets
D&D: different fixed related to Drag&Drop between guest and host operating system
Linux Guest Additions: fixes for kernel modules on recent distributions and kernel 4.19
Security Fixes: this maintenance release includes "Oracle Critical Patch Updates" October, 2018; further details related to CPU October, 2018 are available here.
The Oracle VirtualBox Team