Webhook Event Trigger

A webhook event trigger occurs when an inbound event from another system automatically starts an agent run. This may include a new ticket, inbound email, status callback, chat application event, customer relationship management update, or other webhook-driven workflow.

This deployment pattern creates an elevated exposure condition because the agent may run without a human reviewing the event first. The event payload may contain free text, metadata, links, attachments, or structured fields that the synthetic subject treats as task context.

The primary risk is attacker-shaped event input. Public or weakly authenticated endpoints may allow an external actor to forge, replay, or manipulate event payloads. A single malicious event may then trigger downstream actions, such as ticket routing, message generation, record updates, external calls, or tool execution, before anyone notices.

Investigators should review the event source, webhook authentication, payload content, replay protections, trigger rules, agent run logs, tool calls, downstream actions, and output destinations. Particular attention should be given to forged or repeated events, unusual payload fields, newly observed sources, and actions that exceed the normal event workflow.

Investigative Relevance

Webhook event triggers are relevant because they allow external or third-party system events to initiate agent behavior without direct human oversight. The workflow may appear routine, while the effective instruction is carried in the event payload.

This sub-section is especially relevant where agents process inbound webhooks, status callbacks, chat events, ticket events, email events, customer updates, integration messages, or other automated triggers from public, partner, or weakly trusted systems.