Content Security Policy: The HTTP Header That Shields Websites From XSS Attacks

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Content Security Policy (CSP) is an HTTP response header configured on a server to instruct the browser which sources are trusted for loading resources like JavaScript, CSS, and images. Its primary purpose is to mitigate Cross-Site Scripting (XSS) attacks by blocking scripts that do not originate from approved sources, even if malicious code has already been injected into a page. Beyond XSS, CSP can also help defend against clickjacking, unauthorized iframe loading, and uncontrolled form submissions. A basic CSP directive such as 'default-src self' restricts resource loading to the site's own domain, with stricter policies offering stronger protection. Implementing a rigorous CSP requires carefully whitelisting every trusted resource, making the balance between security and usability a key challenge for developers.

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ProgrammingDEV Community ·

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