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Deprecated X-XSS-Protection header

X-XSS-Protection was a browser feature to detect XSS attacks, but it's now deprecated and can actually introduce vulnerabilities.

Why It Matters

Modern browsers have removed XSS Auditor support. Using X-XSS-Protection can introduce security issues in older browsers. CSP is the recommended replacement.

How We Check

We check if the X-XSS-Protection header is present and warn that it should be removed in favor of CSP.

How to Fix

Remove the X-XSS-Protection header and implement Content Security Policy instead. If you must keep it, use X-XSS-Protection: 0 to disable the filter.

Related Security Checks

Headers

Content Security Policy (CSP)

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