First reported · updated · 7 reports thehackernews.com
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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 →How the wire is made
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