Earlier today, disgruntled security researcher Vasily Kravets released a zero-day vulnerability in the Windows version of the ubiquitous gaming service Steam...the vulnerability allows any user to run arbitrary code with LOCALSYSTEM privileges using just a very few simple commands...
https://arstechnica.com/gaming/2019...ation-exploit-found-in-steam-client-services/
https://arstechnica.com/gaming/2019...ation-exploit-found-in-steam-client-services/