Webhook Security Best Practices for Production 2025-2026

Webhook Security Best Practices for Production A webhook endpoint is a publicly accessible URL that accepts arbitrary POST requests from the internet. Read that sentence again. If that doesn't make you a little nervous, it should. Most webhook tutorials focus on getting things working. Parse the JSON, handle the event, return 200. But a webhook endpoint in production is an attack surface. Without proper security, it's an open door. Verify Signatures. Every Time. This is the single most important thing. Every major webhook provider signs their payloads — Stripe, GitHub, Shopify, Twilio, Slack. The signature proves the request actually came from them and wasn't tampered with in transit. The pattern is always the same: the provider computes an HMAC of the request body using a shared secret, sends the signature in a header, and you recompute the HMAC on your end and compare. Skip this and anyone can POST fake events to your endpoint. A forged payment_intent.succeeded event could grant acce