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What is Cross Site Scripting (XSS)?

DEFINITION:
Cross-site scripting (XSS) is a software vulnerability usually found in Web applications. This XSS allows online criminals to inject client-side script into pages that other users view. The cross-site scripting vulnerability can be employed at the same time by attackers to over-write access controls. This issue can become a significant security risk unless the network administrator or the website owner doesn't take the necessary security means.
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