Varieties of XSSXSS vulnerabilities come in various forms and may be divided into three varieties: reflected, stored, and DOM-based. Although these have several features in common, they also have important differences in how they can be identified and exploited. We will examine each variety of XSS in turnReflected XSS Vulnerabilities A very common example of XSS occurs when an application employs a dynamic page to display error messages to users. Typically, the page takes a parameter containing the message’s text and simply renders this text back to the user within its response. This type of mechanism is convenient for developers, because it allows them to invoke a customized error page from anywhere in the application without needing to hard-code individual messages within the error page itself.This behavior of taking user-supplied input and inserting it into the HTML of the server’s response is one of the signatures of reflected XSS vulnerabilities, and if no filtering or sanitization is being performed, the application is certainly vulnerable. Let’s see howPerforming this simple test serves verifies two important things. First, the contents of the message parameter can be replaced with arbitrary data that gets returned to the browser. Second, whatever processing the server-side application is performing on this data (if any), it is insufficient to prevent us from supplying JavaScript code that is executed when the page is displayed in the browser.This type of simple XSS bug accounts for approximately 75% of the XSS vulnerabilities that exist in real-world web applications. It is called reflected XSS because exploiting the vulnerability involves crafting a request containing embedded JavaScript that is reflected to any user who makes the request. The attack payload is delivered and executed via a single request and response. For this reason, it is also sometimes called first-order XSS.
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