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Security April 12, 2024 10 min read

JWT Authentication Security: Tokens, Refresh Cycles & Revocation

Securing JSON Web Tokens (JWT) in modern web applications: HttpOnly SameSite cookie storage, short-lived access tokens, refresh token rotation, and instant revocation strategies.

MD
Morgan Dynamics Engineering
Morgan Dynamics Engineering
Contents

Common JWT Vulnerabilities

Storing access tokens in browser LocalStorage exposes applications to Cross-Site Scripting (XSS) token theft. Storing tokens in encrypted, HttpOnly, Secure SameSite cookies blocks JavaScript access.

Short-Lived Access Tokens and Refresh Token Rotation

Configuring short-lived JWT access tokens (15-minute validity) combined with single-use refresh token rotation minimizes damage if a token is ever intercepted.

Token Revocation Strategies with Redis Blacklists

Because JWTs are stateless, immediate session revocation (e.g., user logout or security breach) requires checking revocation token IDs against an in-memory Redis blacklist.

CSRF Protection and SameSite Enforcement

Utilizing SameSite=Strict cookie flags alongside anti-CSRF custom request headers protects applications against Cross-Site Request Forgery attacks.

JWTSecurityAuth0OAuth2Cookies

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Article FAQs

Where should JWT tokens be stored on frontends?

In HttpOnly, Secure, SameSite cookies to prevent client-side JavaScript from reading sensitive session credentials.

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