Replit auth

CSRF Token Bypass on Replit

CSRF attacks succeed despite enabled CSRF protection. Malicious sites can perform unauthorized actions.

CSRF tokens not properly validated or exempt endpoints allow attacks.

Error Messages You Might See

Invalid CSRF token Missing CSRF token
Invalid CSRF tokenMissing CSRF token

Common Causes

  1. CSRF exemption too broad (e.g., /api/**)
  2. Token not validated on POST/PUT/DELETE
  3. Cookie-based sessions with permissive domain
  4. Token not included in form or header
  5. SameSite cookie attribute not set

How to Fix It

Keep CSRF enabled by default, exempt only /webhook paths if needed. Use httpOnly cookies for CSRF tokens. Set SameSite=Strict: Set-Cookie: ...; SameSite=Strict. Include token in forms: . Validate referer header for sensitive operations.

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Frequently Asked Questions

How do I include CSRF token in Thymeleaf?

<input type="hidden" th:name="${_csrf.parameterName}" th:value="${_csrf.token}">

Which endpoints need CSRF protection?

All POST/PUT/DELETE that modify data. GET is read-only and doesn't need token

Related Replit Issues

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