openmediavault before 4.1.36 and 5.x before 5.5.12 allows authenticated PHP code injection attacks, via the sortfield POST parameter of rpc.php, because json_encode_safe is not used in config/databasebackend.inc. Successful exploitation allows arbitrary command execution on the underlying operating system as root.
https://www.openmediavault.org/?p=2797
https://github.com/openmediavault/openmediavault/commit/ebb51bbf5a39f4955eab0073bf87f2a31926d85d