Can I root my Cube Talk7x (U51GT-C8) without installing new ROM?
ern0, there is a website that has a download to root this device and it looks like you can do it from the device itself.

If you download http://www.jellydroid.com/framaroot-1-9-0-apk/Framaroot-1.9.0.apk and install it then select install “SuperSU“ and select an exploit in list to potentially root your device as “Barahir” and proceed further.

You should see a success message and then reboot. Hope this works for you.