In my last post I tested 443 proxies and analyzed how safe they are. I have expanded my project by scanning 25443 proxy servers. Not much more than a quarter of the proxies I’ve tested can be considered as safe. This of course includes the HTTP only proxies. If you are using a free proxy server from the internet you can easily get your data stolen. If you use free proxies you should not use them, use them to inject your data into the web. The proxy owners can just extract photos, logins and everything else you use them.”]
Source: https://blog.haschek.at/2015-lets-analyze-twenty-thousand-proxies