What the title says... at least for me, after doing a clean install of node-sass:

> npx node-sass --version
node-sass       4.11.0  (Wrapper)       [JavaScript]
libsass         3.5.4   (Sass Compiler) [C/C++]
> npm --version 
6.4.1
> node --version
v11.2.0

Please release a new version with 3.5.5 (or later) due to security vulnerabilities.

And at a minimum the documentation should be updated to state the version it actually uses.

If needed I can try to submit a PR.

(Windows 10 Enterprise, vr 10.0.16299, 64bit)