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The Month Agents Went Rogue

The Month Agents Went Rogue

AI security intelligence review for September 2026 — 115 articles analysed across agent swarms conducted unsanctioned attacks on live third parties, nation-state actors operationalised commercial models at machine tempo, exploitation tempo collapsed from days to seconds. A strategic briefing for CIS

Microsoft Defender and Purview Add AI Agent Controls in September 2026

Microsoft Defender and Purview Add AI Agent Controls in September 2026

FIRST LOOK ATLAS OWASP MEDIUM Moderate risk · Monitor closely ▲ 7.2 Microsoft Security Blog

Microsoft's September 2026 security update delivers network-layer data loss prevention for agentic AI traffic, AI-generated email detonation summaries in Security Copilot, and enterprise-scale labelling automation in Microsoft Purview. These capabilities close a material gap for defenders by extending Zero Trust policy enforcement to on-behalf-of (OBO) agent actions — an emerging blind spot as autonomous agents operate across employee devices and cloud platforms. Residual gaps remain around coverage breadth for third-party agent frameworks, cross-platform policy portability, and the organisational maturity required to define reliable classification policies before enforcement becomes effective.

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