What are common security issues in JavaScript?
Asked on Sep 04, 2024
Answer
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 XSSAdditional Comment:
✅ Answered with JavaScript best practices.- 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.
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