Cursor
auth
CSRF Protection Accidentally Disabled by Cursor
After Cursor refactored your security middleware, CSRF tokens are no longer being validated. Form submissions succeed even with invalid tokens, creating a serious security vulnerability.
The CSRF middleware was either removed or incorrectly configured during code reorganization.
Error Messages You Might See
ForbiddenError: invalid csrf token
CSRF token mismatch
No CSRF token found
Common Causes
- CSRF middleware commented out or removed during cleanup
- Exemption list too broad, accidentally exempting all routes
- Token name changed (csrf vs _csrf) without updating templates
- Session middleware moved after CSRF middleware in chain
- CSRF middleware configuration set to disabled mode
How to Fix It
Re-enable CSRF middleware: app.use(csrf({cookie: false, sessionKey: 'session'})). Verify token is passed in forms: <input type='hidden' name='_csrf' value='<%= csrfToken %>'>. Only exempt webhook endpoints like /stripe/webhook.
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Get HelpFrequently Asked Questions
How do I disable CSRF for specific routes?
Use middleware options or conditionally apply: app.post('/webhook', (req,res,next) => csrfProtection(req, res, next) || skip middleware).
Why is my AJAX failing with CSRF?
Pass token in X-CSRF-Token header. Fetch the token from the DOM: document.querySelector('meta[name=csrf-token]').content.