Welcome to Android Central! Which phone? Did you install CM Security, or was it preinstalled? Try going to Settings>Apps, select CM Security, and Clear Cache/Clear Data.
Personally, I'd get rid of anything from Cheetah Mobile. The apps they push are generally useless, and they do sneaky things like adding special "features" without warning you. Android's built-in security features (Google Play Protect) already does a lot to secure the phone.