Windsurf
api
Cascade Broke Webhook Signature Validation
Webhook signature validation is broken after Cascade refactored the verification code. This is a critical security issue - spoofed webhooks from attackers are being accepted as legitimate. Stripe or other webhook payloads are not being verified before processing.
Cascade likely removed or modified the signature verification logic during refactoring.
Error Messages You Might See
Webhook signature invalid
HMAC verification failed
Signature mismatch
Webhook authenticity could not be verified
Common Causes
- Cascade removed HMAC-SHA256 signature verification from webhook handler
- Webhook secret changed without updating verification code
- Cascade removed timestamp validation preventing replay attacks
- Algorithm mismatch in signature generation vs verification
How to Fix It
Implement webhook signature verification immediately. Verify request body signature against webhook secret using HMAC-SHA256. Validate timestamp is recent (within 5 minutes) to prevent replay attacks. Verify algorithm used matches webhook provider documentation. Test with invalid signature to ensure rejection.
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Get HelpFrequently Asked Questions
How do I verify Stripe webhooks?
Use stripe.webhooks.constructEvent() with endpoint secret. Catches signature verification and parsing.
What timestamp validation should I do?
Verify t parameter is within last 5 minutes to prevent replay. Check against current system time.