JavaScript Event Handler Vulnerability

Description: A vulnerability in JavaScript event handlers occurs when user-generated events are not properly validated, potentially allowing an attacker to execute malicious code or perform unauthorized actions within a web application. This vulnerability primarily manifests in applications that rely on events such as clicks, scrolls, or keyboard inputs, where user-provided data is processed without adequate verification. The lack of validation can lead to attacks like script injection (XSS), where an attacker can inject malicious JavaScript code that executes in the browsers of other users. The significance of this vulnerability lies in its ability to compromise the security of web applications, exposing sensitive data and allowing unauthorized access to critical functionalities. Therefore, it is essential to implement secure coding practices, such as input sanitization and event validation, to mitigate these risks and protect both users and the integrity of the application.

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