Webhook signature drift

Webhook signature drift is the gap between the payload, timestamp, secret, and verification code that causes a real webhook delivery to fail authentication.

Signature failures are easy to misdiagnose because the payload may look valid and the endpoint may be reachable. The drift can come from using a new secret before the provider has switched, accepting the wrong timestamp tolerance, parsing the body before verification, changing line endings, trimming whitespace, or verifying a transformed JSON object instead of the raw request body.

A useful debugging note keeps the provider event id, delivery attempt, timestamp header, signature header, secret version, raw body handling path, endpoint route, and verification result. It should not expose the secret or full customer payload. The goal is to preserve the verification shape without leaking sensitive data.

The boundary is that not every failed signature is a security incident. Some are deployment or middleware mistakes. However, the handler should fail closed: reject the event, log the trace id, and avoid running business logic until verification is clear.

Practical interpretation: when a webhook fails signature verification, first ask whether the receiver verified the exact raw bytes the provider signed. If not, debugging handler logic is premature.

Webhook signature drift debugging 2026 06

// COMMENTS

ON THIS PAGE

Webhook signature drift debugging 2026 06

// COMMENTS ↓ Newest First

ON THIS PAGE

// COMMENTS