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CSP (Content Security Policy) | Glossary

Content Security Policy (CSP) is an HTTP response header that tells the browser which content sources (scripts, styles, images, etc.) are trusted and permitted to load on a page. It is one of the most effective defences against XSS.

Why it matters: A strict CSP prevents injected scripts from executing, significantly reducing the blast radius of XSS attacks and data injection.

Quick tips:

Start with Content-Security-Policy-Report-Only to audit before enforcing.
Use nonces or hashes for inline scripts rather than 'unsafe-inline'.
Keep the policy as restrictive as possible and audit third-party sources regularly.