Over-privileged access means a system, account, or agent has more permissions than it needs to do its job. In cybersecurity, this is a classic least-privilege failure: if something can read, write, delete, approve, or execute beyond its purpose, the security boundary becomes much weaker.
This matters because excessive permissions increase blast radius. A stolen credential, a misconfiguration, a buggy automation, or a manipulated AI agent can do far more damage when access is broad. In real environments, defenders reduce this risk by separating read-only from write actions, narrowing API scopes, using just-in-time access, and requiring human approval for sensitive operations. In agentic systems, over-privileged access is especially dangerous because the agent can act autonomously through tools and workflows. Tight permissions, logging, and approval gates help keep useful automation from becoming an operational risk.