Webhook Authentication

Overview

Common mechanisms include message authentication codes over the payload, digital signatures, mutual TLS, and authenticated gateway credentials. Verification should cover the exact received bytes and bind relevant metadata such as timestamp, event identifier, destination, or protocol version.

A shared secret in an ordinary header is vulnerable if requests can be observed or replayed. Parsing and reserializing content before verification, accepting multiple ambiguous encodings, skipping failed checks, or exposing secrets in logs can make apparently authenticated requests unsafe.

Recipients should verify signatures before processing, use constant-time comparison where appropriate, enforce freshness and replay protection, rotate keys safely, and fail closed. Key identifiers, algorithm versions, canonicalization rules, and secret distribution need explicit documentation and monitored migration.

For Webhook Authentication, repeated renewal is a signal that the underlying design needs correction.

Webhook authentication enables a recipient to verify that a webhook request came from the expected sender under an established trust relationship. Webhook authentication requires verification over exact message content plus secure keys, freshness, replay defense, strict failure behavior, and controlled rotation.

For Webhook Authentication, the trust decision should establish Webhook authentication enables a recipient to verify that a webhook request came from the expected sender under an established trust relationship and bind the result to the requested action and protected resource. Teams should test issuance, storage, validation, expiry, revocation, recovery, and privileged override for identity proof and credential state, rather than checking only a successful request. Logs concerning the Webhook identity check and identity proof and credential state should support investigation without exposing reusable secrets or unnecessary personal data.

Review of Webhook Authentication should compare permitted and rejected actions related to identity proof and credential state, confirm that recovery cannot bypass the primary safeguard, and remove obsolete access promptly.