n8n workflows are automation, but they’re also attack surface: webhooks that accept external input, credentials with real system access, and workflow logic that can be manipulated if the inputs feeding it aren’t validated. This service hardens that surface without slowing down the automation itself — delivered jointly with n8n build work from Harrison Ndeke.
What gets reviewed
- Webhook authentication — signature verification, replay protection, rate limiting on public-facing triggers.
- Credential handling — scoped API keys, no credentials embedded in the workflow canvas, rotation policy.
- Workflow permission boundaries — what a workflow can actually do if a node is compromised or misconfigured.
- Input validation — schema validation at every external-input boundary before it reaches downstream logic.
Frequently asked questions
Does this replace Harrison's n8n build work, or sit alongside it?
Alongside — Harrison builds the workflow, this service hardens it. Many clients scope both together so security review happens during the build, not as a separate afterthought.
What's the most common n8n security mistake you find?
Webhooks with no signature verification, accepting any payload from any sender — often left that way because it "worked" during initial testing and was never revisited before going to production.
Can a compromised n8n node take down other workflows?
It depends on credential scoping and permission boundaries — this review specifically maps what a workflow can actually reach if one node is compromised or misconfigured, so the blast radius is known rather than assumed.
Do you review self-hosted and cloud-hosted n8n instances differently?
The workflow-level review (webhooks, credentials, permissions, validation) applies to both. Self-hosted instances add infrastructure-level questions — concurrency, queue mode, and database security — that are scoped separately if relevant.
Evidence and method
Monitoring and detection capability relevant to production n8n security is demonstrated in HarLyn Sentinel. See also the field note Securing n8n Workflows: A Practitioner's Checklist.
Related
Secure Automation & AI Workflow Review (service) · n8n Automation Services (Harrison Ndeke) · HarLyn Digital Partners