A consent boundary is the point where a user explicitly approves what data an app, assistant, or connected service may access, and what actions it may perform. It separates the user-controlled part of a system from the privileged part that can reach emails, files, photos, messages, or account settings.
This matters in cyber security because many modern attacks try to cross that boundary by tricking users into granting excessive permissions, approving a fake integration, or reusing an old authorization. In AI products, the boundary is especially important when an assistant can connect to services like mail, storage, or media accounts. Defenders should review scopes, limit unnecessary access, require strong authentication, and make revocation easy. Users should treat consent prompts as security decisions, not just usability dialogs.