Prevent cross-site scripting (XSS) attacks

[EthanThatOneKid]

Your application may need to display user-generated content within HTML. To prevent cross-site scripting (XSS) attacks, it is crucial to escape special characters like <, >, &, ", and ' before embedding user input into HTML.

Reference

• https://docs.deno.com/runtime/reference/std/html/
• https://jsr.io/@std/html/doc

[abhigyan17]

Excellent point on XSS prevention. Beyond HTML entity escaping, here are additional layers:

1. Context-aware escaping: Different contexts (HTML body, attributes, JavaScript, CSS, URL) require different escaping strategies. Use libraries that understand context.

2. Content Security Policy (CSP): Implement strict CSP headers to prevent inline script execution and control script sources.

3. Input validation: Whitelist acceptable input patterns. Even with escaping, validation prevents malformed data.

4. Output encoding: Always encode data at the point of output based on context.

5. HTTPOnly cookies: Prevent JavaScript access to session tokens even if XSS succeeds.

6. Regular security testing: Automated SAST tools like OWASP ZAP or Burp Suite's XSS detection should be part of your CI/CD pipeline.

7. Developer training: XSS remains prevalent because developers forget to escape. Regular security training is critical.

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