www.wysiwygwebbuilder.com

CssMenu

LightHouse Best Practices

Includes front-end JavaScript libraries with known security vulnerabilities 5 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers. Learn more.

Bootstrap@3.3.5
Vulnerability Count:5
Highest Severity: Medium

Ensure CSP is effective against XSS attacks
Passed audits (16)
Not applicable (1)

The CSS menu does not Bootstrap.
Also, I am pretty sure the CSS does not have any vulnerabilities.

The page/site only has one object: CssMenu with 5 BreakPoints

https://mysnapsonline.com/index.html

I think it is related to 'affix', which is part of Bootstrap. This may confuse LightHouse into thinking that the entire Bootstrap library is included, but it isn't.
This particular file does not have any vulnerabilities. All it does it scroll the page.

Thanks Pablo.