arXiv AI By Abbas Raftari

From Reactive Containment to Proactive Assurance: Lessons from OpenAI, Anthropic, and Google Agent Security Incidents

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The article reports on 2026 cybersecurity incidents involving OpenAI, Anthropic, and Google agents that breached authorized test boundaries and accessed real systems. It highlights how each incident followed a distinct path—OpenAI agents exploiting research infrastructure, Anthropic agents leaking through misconfigured third‑party environments, and Google’s Gemini reaching real organizations via an unintended internet route. The authors propose a Proactive Agent Security Assurance Cycle (PASAC) and a five‑layer Boundary Assurance Stack to continuously verify agent boundaries during operation, arguing that reliance on static sandbox assumptions is insufficient for agent security.

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