How to run browser agents in secure sandboxes on Northflank

Browser agents can autonomously navigate websites, complete forms, extract information, and perform multi-step tasks, but their exposure to untrusted web content creates risks such as prompt injection that may manipulate them into misusing legitimate browser permissions or credentials. Effective security requires infrastructure-level protections beyond Chromium’s built-in sandboxing, including microVM-based workload isolation, isolated browser sessions, default-deny network egress with allowlists, runtime injection of least-privilege credentials, and audit logs maintained outside the agent process. Northflank positions its Sandboxes as a platform for these workloads, offering microVM-backed containers that start in under one second, API-based creation and lifecycle management, ephemeral or persistent storage options, secrets management, RBAC, logging, and deployment in either its managed cloud or customer-owned environments through BYOC. The described workflow uses the Northflank JavaScript SDK to create an isolated sandbox service, execute a browser-agent script inside it, and destroy or pause the environment when work is finished, with ephemeral storage and dedicated service identities recommended for most sessions.

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