Browser token storage involves trading off Cross-Site Scripting (XSS) risks against Cross-Site Request Forgery (CSRF) risks:

- **LocalStorage / SessionStorage**: Vulnerable to **XSS attacks**. Any malicious JavaScript running in the domain context can read stored tokens.
- **Standard HTTP Cookies**: Vulnerable to **CSRF attacks** unless protected with proper `SameSite` flags and anti-CSRF tokens.
- **`httpOnly`, `Secure`, `SameSite=Strict` Cookies**: **Best Security Standard**. `httpOnly` prevents client-side JavaScript from reading the cookie (mitigating XSS extraction), while `Secure` forces HTTPS transmission and `SameSite` mitigates CSRF.

Q13: Where should JWTs be stored in browser-based applications to prevent XSS and CSRF?

Q14: Explain the JWT `alg: none` security vulnerability and how to defend against it.

Q12: How does Refresh Token Rotation with Reuse Detection safeguard single page applications?

Comprehensive technical interview bank covering token-based security, protocol grant flows, cryptographic signatures, session management, and enterprise API security.

50 Essential Interview Questions: JWT, OAuth 2.0, OIDC, and API Security

Q13: Where should JWTs be stored in browser-based applications to prevent XSS and CSRF? - 50 Essential Interview Questions: JWT, OAuth 2.0, OIDC, and API Security

Q13: Where should JWTs be stored in browser-based applications to prevent XSS and CSRF?

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