To hackers, spies, and cyber-criminals these days, calling Tor “secure” is a bit laughable. There are so many exploits and workarounds, along with unavoidable weaknesses to side-channel attacks performed in the physical world, that in some cases the false sense of cyber-security can end up making relaxed use of Tor less secure than paranoid use of the regular internet.

http://www.extremetech.com/internet/218152-tor-is-getting-a-major-security-upgrade