Cross-Site Scripting (XSS) is a vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. To protect against XSS, it's essential to validate and sanitize all user input, use secure coding practices like output encoding, and implement security measures like Content Security Policy (CSP).

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Header	Value
X-XSS-Protection	1; mode = block

Multiple X-XSS-Protection headers are not allowed.

The header contains multiple conflicting values, the behavior is undefined and varies across browsers. When the XSS protection header includes multiple conflicting values, it results in undefined behavior due to varying interpretations by different browsers. Such inconsistencies can inadvertently weaken security measures, as each browser might enforce different security rules. Therefore, it's crucial to define security headers clearly and without ambiguity to guarantee consistent protection across all web browsers.