TeXnicCenter doesn't spawn child processes in a secure way.
Steps to reproduce: Create an executable file called Program.exe which shows a popup message, and place it in your C:\ root directory. Next, create a TeXnicCenter project, put some basic LaTeX code in it, and press CTRL+Shift+F5. Your LaTeX code will fail to compile, and the popup message will be shown.
This is a huge security vulnerability. If Program.exe were malicious and UAC is disabled or TeXnicCenter was running with elevated privileges, then serious damage could result.
I am using TeXnicCenter 1.0 Stable Release Candidate 1