CSP: font-src

The HTTP Content-Security-Policy (CSP) font-src directive specifies valid sources for fonts loaded using @font-face.

One or more sources can be allowed for the font-src policy:

Content-Security-Policy: font-src <source>;
Content-Security-Policy: font-src <source> <source>;

<source> can be any one of the values listed in CSP Source Values.

Note that this same set of values can be used in all fetch directives (and a number of other directives).

Given this CSP header:

Content-Security-Policy: font-src https://example.com/

The following font resource loading is blocked and won't load:

<style>
  @font-face {
    font-family: "MyFont";
    src: url("https://not-example.com/font");
  }
  body {
    font-family: "MyFont";
  }
</style>

• Content-Security-Policy
• @font-face