Implement CSP with nonces
Prevent XSS with strict CSP
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Implement a strict Content Security Policy using nonces for inline scripts in a [Next.js/Express] application. Generate a cryptographic nonce per request, inject it into the CSP header and script tags, and verify the policy blocks XSS in common attack scenarios. Handle third-party scripts.
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En Next.js, injectez le nonce dans l’en-tête CSP via `middleware.ts` et transmettez-le au layout avec `React.cache()`. Cela garantit un nonce unique par requête et évite les répétitions dans les scripts inline : `dangerouslySetInnerHTML` devient sécurisé sans durcir le hash.
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