Content Security Policy (CSP) is a web security mechanism that dictates which sources of content can be loaded on a webpage to prevent threats like Cross-Site Scripting (XSS). Through HTTP headers, site owners can set approved content sources and report any policy violations.

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Content Secure Policy header is not present

When a Content Security Policy (CSP) header is not present on a website, it means the site is not using this layer of security to restrict where content can be loaded from, potentially increasing vulnerability to attacks like Cross-Site Scripting (XSS). Without CSP, the site relies more heavily on other security measures like input sanitization, which may not be as effective against content injection attacks. Browsers will default to their own less strict security policies, potentially leaving the site more exposed to exploits. The absence of CSP also allows for unrestricted loading of external resources, which can be a security risk if not managed carefully.