Microsoft unveiled three new security features for enterprise AI agents on October 19, 2026: Dynamic Permissions, Dynamic Agent Risk, and Dynamic Conditional Access. These tools adopt a least-privilege approach, granting agents minimal access and adjusting it in real time based on detected risk signals. Microsoft Defender can now identify up to 60 different AI agent types, up from 25 previously. These capabilities, integrated into Microsoft 365 E7 at $99 per user per month, aim to address permission overprivileging, prompt injection attacks, and behavioral drift in AI agents. The goal is to replace static access controls with continuous risk evaluation.
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