Webhooks between your services: signature, replay, and data in transit
> TL;DR: Webhooks leaving a payroll tool for an accounting system carry sensitive amounts. What to actually verify.
How do you secure webhooks in your product?
The payroll webhook is a forgotten surface
Each month, webhooks leave the payroll tool for accounting, product, ERP. They carry amounts, identities, sometimes partial IBANs.
For more — see our application security offer.
What must exist
The concrete test
Replay a signed webhook two hours later. If the receiver accepts it, that's a design issue, not just a setting.
For software vendors
CleanIssue specializes in security reviews for software handling sensitive data. If you're building a product, payroll tool, or ATS and want an external review of your exposure before a client audit or security questionnaire, see our offer for software vendors.
Key Takeaways
Building software? CleanIssue performs security audits for your product in real-world conditions, no source code access needed. For a first read of your exposure, start with an external review of your application.
Go further
Related articles
Three adjacent analyses to keep exploring the same attack surface.
Third-party APIs (Silae, PayFit, Lucca): where to look at integration security
Third-party integrations often create their own exposure surface: secrets, webhooks, identity mapping, and logs.
n8n webhooks: why your automations are vulnerable to attacks
n8n webhooks exposed in frontend allow unauthenticated attacks. Here's how to secure your workflows.
Enterprise SSO: SAML and SCIM pitfalls that show up in production
SSO integration is where most products introduce authentication flaws. The points to review from the vendor side.
Sources
Editorial analysis based on official vendor, project, and regulator documentation.
Related services
If this topic maps to a real risk in your stack, these are the most relevant CleanIssue audits.