trusteddomain.com is somehow compromised, the script may be altered to load data from (or send data to)
untrusteddomain.com. A CSP will prevent that by explicitly blocking actions from domains you don’t trust.
Below is an example of a violation that I captured from my console. I trust Google to serve ads, but don’t allow
eval to run (this allows dynamic code from strings to be evaluated and executed, as opposed to static code that is included in files). Certain ads try to use this feature and are stopped cold by the CSP. If all ads tried to do this, I would simply remove them altogether or switch to another provider.
The typical way to implement a CSP is by serving an HTTP header named
Content-Security-Policy. Most web servers can be configured to provide this, and some static hosting services like Netlify allow you to specify a special file that is parsed to include custom headers. If these options aren’t available, you can implement your CSP with a meta tag. This is the CSP policy for my blog as of this writing.
<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests; block-all-mixed-content; defau
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