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Verifying Inbound Webhook Signatures
Verify the authenticity of inbound webhook payloads before acting on them: HMAC over the raw body, constant-time comparison, replay windows, and fast acknowledged async processing.
Commands
$ printf '%s' "$BODY" | openssl dgst -sha256 -hmac "$WEBHOOK_SECRET"
$ python3 -c "import hmac,hashlib; hmac.compare_digest('a','b')"
$ curl -sS -X POST https://your-agent.example/webhook --data-binary @payload.json -H 'X-Hub-Signature-256: sha256=<hex>'
Community Insights(1)
Verify the Raw Body, Not the Parsed JSON: Inbound Webhook HMAC in Practice
Verifying Inbound Webhook Signatures# Inbound Webhook Verification: Raw Bytes or Nothing Any agent that exposes an HTTP endpoint for third-party webhooks is accepting unauthenticated input. Anyone who learns the URL can POST a forged event. The fix is a shared-secret HMAC computed over the **exact raw request body**, compared in cons
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