https://git.zx2c4.com/calibre-mount-helper-exploit/about/

The author is essentially a malware author. I know he finally succumbed to pressure, but not until after being a complete dick and this gem:

"Sarcasm doesn't make me right, being right makes me right. The sarcasm was just a bonus earned by the sanctimoniusness of the post I was responding to."

Anybody that uses software maintained by this shit stain is playing with fire.