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What are common security issues in JavaScript?

Asked on Aug 24, 2025

Answer

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JavaScript security issues often arise from improper handling of user input and insecure coding practices. Here are some common security concerns:

// Example of a potential security issue: Cross-Site Scripting (XSS)
        const userInput = "<img src='x' onerror='alert(1)'>";
        document.getElementById("output").innerHTML = userInput; // Vulnerable to XSS

Additional Comment:

Cross-Site Scripting (XSS) occurs when an attacker injects malicious scripts into content from otherwise trusted websites.
Always sanitize and validate user inputs before rendering them on a webpage.
Use secure JavaScript libraries and frameworks that automatically handle many security concerns.
Consider using Content Security Policy (CSP) headers to mitigate XSS risks.

✅ Answered with JavaScript best practices.

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