First reported · updated · 3 reports openai.com
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First reported · updated · 3 reports redmondmag.com
Agent Sprawl Is the New Shadow IT And You Probably Can't Count Yours
Redmond Magazine reports on how Microsoft is using its Agent 365 control plane to govern and inventory hundreds of thousands of AI agents across its internal environment, addressing what it calls agent sprawl. The approach centers on automatic metadata collection, ownership, lifecycle tracking and risk signals for agents created via Microsoft 365 Copilot, SharePoint, Teams, Copilot Studio, Microsoft Foundry and third-party platforms. Details →First reported microsoft.com
Defending the Inbox Against Prompt Injection Attacks
Microsoft announced a new Microsoft Defender for Office 365 capability that detects and quarantines malicious AI instructions (prompt injection) embedded in email before delivery, aiming to stop indirect prompt injection from reaching Copilot and Microsoft 365 agents. The post cites publicly disclosed research such as Morris II and EchoLeak as evidence that email is a high-volume ingress channel for AI-targeted attacks, describing techniques like white-on-white text, zero-width Unicode, and hidden HTML instructions. Details →First reported microsoft.com
Prompt injection protection in Microsoft Defender for Office 365 - Microsoft Defender for Office 365 | Microsoft Learn
Microsoft documentation describes prompt injection protection built into Microsoft Defender for Office 365, which detects attacker-authored instructions embedded in inbound email (body, subject, quoted replies, attachments, or hidden markup) before that content reaches a user or an AI assistant such as Microsoft 365 Copilot. The feature explains indirect prompt injection techniques including direct instructions to the model and hidden/invisible text (white-on-white fonts, zero-size text, HTML/CSS tricks) and detects them as part of existing mail-flow inspection. Details →First reported theregister.com
Microsoft builds a bouncer to keep bots out of Teams meetings
The Register reports that Microsoft is rolling out bot-detection technology for Teams meetings that uses behavioral and infrastructure signals to distinguish bots from humans, requiring a human in the lobby to deliberately admit a bot. The move responds to unwanted bots—including third-party transcription and meeting-assistant bots—automatically joining meetings that may involve sensitive or NDA-covered discussions, and will add an ISV registration path for known bots while retiring CAPTCHAs. Details →How the wire is made
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