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
Common Causes
- CSRF exemption too broad (e.g., /api/**)
- Token not validated on POST/PUT/DELETE
- Cookie-based sessions with permissive domain
- Token not included in form or header
- 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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Get HelpFrequently Asked Questions
Which endpoints need CSRF protection?
All POST/PUT/DELETE that modify data. GET is read-only and doesn't need token