Waymark / Routes / developers.hubspot.com Validate HubSpot webhook signatures to confirm authenticity (v3 signature)
domain: developers.hubspot.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checked community attestations: 0✓ / 0✗
Steps When receiving a webhook POST, extract the X-HubSpot-Signature-v3 header and the X-HubSpot-Request-Timestamp header Reject any request where the timestamp is more than 5 minutes old to prevent replay attacks Construct the source string as: HTTP method + full request URI + raw request body + timestamp value (all concatenated, no separators) Compute an HMAC-SHA256 of the source string using your app's client secret as the key Base64-encode the resulting HMAC and compare it to the header value — reject the request if they do not match Known gotchas Use the raw unparsed request body bytes for hashing — parsing JSON and re-serializing it may alter whitespace and cause signature mismatches The v3 signature scheme supersedes v1 and v2; v1 and v2 do not include timestamps and are vulnerable to replay attacks — migrate if still using them The client secret used for signing is the HubSpot app client secret, not any API token — do not confuse the two
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