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Security · hard

45. Web Security: XSS, CSRF and CSP

Frontend vulnerability mitigation.

1 min read3 questionsup to 50 XPtopic 45/50

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Cross-Site Scripting (XSS) allows attackers to execute malicious scripts in users' browsers. Content Security Policy (CSP) headers and input sanitization protect against XSS.

http
Content-Security-Policy: default-src 'self'; script-src 'self' [https://trusted.cdn.com](https://trusted.cdn.com)

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Check your understanding

  1. 1. What is the primary danger of XSS in a Web3 dApp?

  2. 2. What header restricts where scripts and connections can be loaded from?

  3. 3. Can client-side JavaScript securely hide an API secret key?

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