Webhook signature verification is the validation of a cryptographic signature on incoming webhook requests to confirm the sender and detect tampering. It matters because webhooks bring external input directly into internal systems and therefore need stronger trust checks than simple source assumptions.
What is Webhook Signature Verification?
Without signature verification, attackers may spoof webhook calls, inject false events, or replay captured traffic. Strong webhook security usually also includes timestamp checks, secret rotation, event idempotency, and narrow processing rules.
What Webhook Signature Verification Commonly Supports
Common uses include integration security, event authenticity, SaaS trust validation, and inbound API hardening.
Webhook Signature Verification vs. Unauthenticated Webhook Acceptance
Webhook signature verification checks message authenticity and integrity. Unauthenticated acceptance trusts inbound calls too easily.
Frequently Asked Questions
Why verify webhook signatures?
Because source IPs and endpoint secrecy are weak substitutes for strong sender authenticity checks.
Is a shared secret enough?
It helps, but good handling also includes replay protection and careful secret management.
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