The Cross-Site Scripting (XSS) Vulnerability: Definition and Prevention

To understand the cross-site scripting vulnerability, you have to first understand the basic concept of the Same Origin Policy (SOP), which forbids websites to retrieve content from pages with another origin. By forbidding access to cross-origin content, random websites cannot read or modify data from your Facebook page or PayPal account while logged in to them.

SOP is one of the most important security principles in every web browser. For example, the page https://example.com/index.html can...

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