An issue in China Mobile OA Mailbox PC v2.9.23 allows remote attackers to execute arbitrary commands on a victim host via user interaction with a crafted EML file sent to their OA mailbox.
https://github.com/YZLCQX/Mailbox-remote-command-execution
https://gist.github.com/YZLCQX/0da0a438292a5479470c52dad8210462