Input Validation / Server-Side JavaScript Code Injection

Web and API


Server-side JavaScript code injection is a type of security vulnerability that occurs when a malicious entity is able to inject malicious code into a web or API server that is then executed on the server side. The vulnerability is categorized in the Common Weakness Enumeration (CWE) directory as CWE-95, Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection'). As described in the OWASP Testing Guide, this vulnerability can be exploited when the application does not sufficiently sanitize user input, allowing malicious code to be injected into the input and subsequently executed.


Server-side JavaScript code injection can lead to significant threats to the security of the application and its data, including exposure of sensitive information, data manipulation, and even server takeover. Because of the severity of these risks, the vulnerability has been assigned a base score of 9.0, indicating a critical risk.


The best solution to Server-side JavaScript code injection is to sanitize user input to prevent malicious code from being injected into the input. This can be done by using a whitelist of allowed characters and rejecting all other characters. Additionally, the application should use secure coding practices to disable the use of the "eval" function to prevent JavaScript code execution.

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