Using Hashes to Stop Inline Script XSS
Inline scripts are one of the easiest ways to accidentally punch a hole through your XSS defenses. If you allow <script> blocks or inline event handlers without strict controls, an attacker only needs one HTML injection point to start running JavaScript in your users’ browsers. CSP hashes are one of the cleanest ways to keep a small amount of inline JavaScript while still blocking everything else. This guide is the practical version: what hashes do, when to use them, how to generate them, and the exact headers to copy and paste. ...