Your SIEM Cannot See Your AI Agents. Attackers Know This.

Stellar Cyber just published a threat landscape analysis for agentic AI in late 2026. The headline finding: NHI (non-human identity) compromise is the fastest-growing attack vector in enterprise infrastructure, according to the Huntress 2026 data breach report. But the detail that should keep CISOs awake is this: Your SIEM and EDR tools were built to detect anomalies in human behavior. An agent that runs code perfectly 10,000 times in sequence looks normal to these systems. But that agent might be executing an attacker's will. This is the observability blind spot nobody is talking about. Traditional security tools pattern-match against human baselines — login times, geographic anomalies, typing patterns. An AI agent operating under attacker control looks identical to one operating normally, because both execute with perfect consistency. Why Detection Fails Stellar Cyber's analysis maps the shift: Generative AI: sandbox, session-based memory, pattern-based detection (easier) Agentic AI: