The reason dorks like inurl:index.php?id= are so popular among hackers and bug bounty hunters is that they directly target dynamic web pages that use user-supplied input (the id parameter) to build a response. If the application's backend code is not written securely, this structure is a gateway for several critical vulnerabilities.
However, this simple and common structure is also the primary attack vector for one of the most notorious security vulnerabilities on the web.
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