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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsTo secure a webhook receiver, verify the provider’s signature against the exact request-body bytes before processing, apply timestamp freshness checks only when the provider signs a timestamp, and use delivery-ID deduplication plus idempotent business operations to limit replay and duplicate effects. The details vary by provider: GitHub’s documented scheme uses a body HMAC and delivery ID, while Svix signs an ID, timestamp, and raw body together.
Webhook receiver security checklist
- Read the provider’s signing specification. Identify its current signature header, algorithm, encoding, signed data, timestamp rules, delivery ID, redelivery behavior, and acknowledgment deadline. Do not assume one provider’s format applies to another.
- Capture the raw request body. Preserve the original bytes and verify the signature before JSON parsing, character conversion, or reserialization. Middleware and proxies must not alter the signed body or relevant headers.
- Verify before business processing. Use a reputable library or runtime API for the documented algorithm and a constant-time comparison. Reject a missing or invalid signature before performing side effects.
- Enforce freshness only when specified. If the sender signs a timestamp, check it against the sender’s documented tolerance and keep receiver clocks synchronized. A timestamp header that is not covered by the signature is not authenticated by virtue of being present.
- Deduplicate and make processing idempotent. Record stable delivery IDs and ensure that repeating an accepted event cannot create the same business effect twice. Define how deliberate redelivery or recovery should work.
- Validate the event before acting. Check event type or action and required payload fields. Design for out-of-order delivery if event chronology matters.
- Protect the channel and secret. Use HTTPS with certificate validation enabled. Where supported, use a high-entropy per-webhook secret, store it in a server-side secret manager or equivalent, and do not commit it to source control. IP allowlisting can add a layer if you can keep the provider’s current ranges updated.
- Acknowledge promptly. Return the provider-appropriate success response and queue longer work where suitable. Follow the provider’s own deadline rather than borrowing another provider’s target.
How signature validation works
Verify the exact bytes first
A signature authenticates specific data, not an abstract JSON object. Parsing and serializing JSON again can change whitespace, escaping, or key order, producing different bytes even when the resulting data appears equivalent. Read the raw body, calculate the expected signature over precisely the provider-defined content, then compare it with the supplied signature. GitHub explicitly cautions against modifying payloads or headers before validation and documents constant-time comparison in its signature validation guidance.
Use the provider’s current algorithm and comparison method
Use the algorithm and header the sender currently documents. Do not substitute a deprecated or legacy header without a specific compatibility requirement. Compare signatures with a constant-time function; ordinary string equality can expose timing differences. The secret must remain server-side, be protected from logs and client exposure, and be rotated through a procedure compatible with the provider and receiver.
GitHub webhooks: body HMAC and delivery-ID deduplication
For GitHub, configure a high-entropy secret and validate X-Hub-Signature-256, an HMAC hex digest using SHA-256. GitHub also includes X-Hub-Signature, a legacy SHA-1 header for compatibility; its current validation guidance recommends the SHA-256 header. Follow GitHub’s validation examples for raw-body handling and constant-time comparison.
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GitHub identifies X-GitHub-Delivery as the unique delivery identifier. Store and check it to prevent an already handled delivery from repeating business effects. GitHub notes that a requested redelivery retains the original ID, so make the recovery policy deliberate: an intentional retry should be possible operationally without accidentally repeating an external side effect. See GitHub’s webhook best practices.
GitHub’s cited signature scheme is a body HMAC; that guidance does not document a signed timestamp freshness window. Do not invent a timestamp check for GitHub deliveries or treat an unsigned timestamp header as proof of freshness. GitHub recommends returning a 2XX response within 10 seconds; queue slow work if needed. Its troubleshooting guidance also warns that deliveries can arrive out of order. If chronology matters, use timestamps in the payload for event ordering, separately from signature freshness, and follow GitHub’s troubleshooting guidance.
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Svix webhooks: signed timestamp and message ID
Svix documents three relevant headers: Webhook-Id, Webhook-Timestamp (Unix seconds), and Webhook-Signature. Its signing construction combines the message ID, timestamp, and raw body, separated by periods. Verify that exact construction with the raw request body; parsing and stringifying JSON before verification can break the check. Follow Svix’s receiver verification guide rather than applying GitHub’s HMAC format.
Svix says its libraries reject timestamps more than five minutes in the past or future. That is the behavior documented for Svix libraries, not a universal webhook tolerance. Use the provider’s SDK or implement its documented construction and freshness policy accurately. Svix’s delivery guidance uses a 2XX within 15 seconds as an example of a reasonable response time for Svix; it is not a deadline for other senders. See Svix’s delivery guide.
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Replay protection and duplicate side effects
A valid signature proves that a request matches signed data and secret; by itself, it does not make an old captured request unusable. Replay resistance therefore depends on what the provider signs and what the receiver remembers.
- Signed timestamp: Reject a request outside the provider-documented freshness window when the timestamp is part of the signed content. Keep clock synchronization and tolerance appropriate to that specification.
- Stable delivery ID: Persist IDs already accepted or completed and recognize repeats. Choose retention that suits your delivery and recovery model; do not assume an ID has universal meaning across providers.
- Idempotent operations: Make the underlying action safe to repeat, such as by using an idempotency key or recording the event’s effect transactionally. Deduplication and idempotency address different failure modes and are strongest together.
The OWASP webhook page recommends timestamp validation alongside event-ID deduplication, but it is draft guidance rather than a universal protocol specification: OWASP Webhook Security Cheat Sheet. When a provider supplies no signed timestamp, use its documented signature method, stable-ID handling where available, and idempotent processing rather than fabricating an authenticated timestamp scheme.
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Safe event handling and operations
Separate receipt from longer work
After signature and freshness checks, validate the event type and payload fields your application expects. Acknowledge promptly according to the sender’s documented response requirement, then queue work that may take longer. This reduces timeouts and avoids making delivery success depend on the duration of unrelated downstream work.
Plan for ordering and recovery
Some senders can deliver events out of order. If state transitions depend on chronology, use trustworthy event-time information and application rules that tolerate late arrivals; do not infer chronology from arrival order alone. Keep operational recovery distinct from accepting duplicate side effects: record delivery state and define what an authorized redelivery should do.
Quick Recap
Maintain secrets, certificates, and network controls
- Keep secrets in a secure server-side store; restrict access and avoid logging them.
- Use HTTPS and leave certificate verification enabled.
- Consider source-IP allowlisting only as an additional control. Provider IP ranges can change, so maintain them from the provider’s current published information.
- Test the deployed path, not only local code: confirm proxies and middleware preserve the raw body and signature-related headers.
What to verify before deployment
- The receiver uses the provider’s documented current signature header, algorithm, encoding, and signed-content construction.
- Verification operates on original bytes and runs before parsing or any business side effect.
- Signature comparison is constant-time and missing or invalid signatures are rejected.
- Timestamp freshness is enforced only when the provider signs a timestamp, using its stated tolerance.
- Delivery IDs are retained and checked, with a defined redelivery and recovery policy.
- Business operations are idempotent and handle duplicate and out-of-order events safely.
- Secrets are high-entropy where supported and stored securely; HTTPS certificate validation remains enabled.
- Responses meet the specific provider’s acknowledgment deadline, with slower processing queued where appropriate.
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