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Cross-site scripting (XSS) is one of the most common vulnerabilities. Unlike other vulnerabilities, it is related to undocumented features of a page of the site visited by an attacker that allows him or her to change the contents of the page.
Definition | Cross-site scripting (XSS) is a vulnerability that appears as a result of insufficient filtration of data received from a malicious person and then sent to third parties. |
Therefore, systems that receive data from users and display it on other users' browsers are vulnerable to an XSS attack.
Examples of such systems are chats, forums, and Web mail.
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