2.11.168 is the latest firmware for My Cloud Mirror gen 1 [1]. 2.30.165 is the latest firmware for My Cloud Mirror gen 2 [2].

Both firmwares were released in Nov 2017, and I suspect the vulnerabilities were fixed at that time as well. At the very least nas_sharing.cgi was removed in both versions. But I haven't had a chance to finish my investigations [3].

[1] https://support.wdc.com/downloads.aspx?g=907

[2] https://support.wdc.com/downloads.aspx?g=910

[3] https://gist.github.com/bmaupin/c38c777a0e4fad737a14718b1092...