Post by Christopher Nett

Microsoft 365 Copilot does not create new groundbreaking security issues. It exposes the quality issues of the identity and data security model you already have. How Access Works 🔐 Entra ID: Copilot runs in the signed-in user's context, so Conditional Access, MFA, and Microsoft 365 role-based access still matter. 🔐 Graph Grounding: Copilot uses Microsoft Graph to retrieve emails, chats, files, meetings, and other content the user is allowed to see. 🔐 Permission Scope: If Alice cannot view a SharePoint file, Copilot also cannot. 🔐 Oversharing Risk: If a site is open to too many users, Copilot can make that weak permission model much easier to notice. What Still Protects Data 🛡️ Sensitivity Labels: Purview sensitivity labels are honored by Copilot, including encryption. 🛡️ DLP: Data Loss Prevention can detect sensitive items and help stop users from sharing them through AI interactions. 🛡️ Retention: Copilot interaction data can be managed with Microsoft Purview retention policies and Content search. 🛡️ Audit: Prompts and responses are captured in the unified audit log for supported Copilot and AI activities. Where Teams Get It Wrong ⚠️ Assuming Privacy Equals Permissions: Prompts, responses, and data accessed through Microsoft Graph are not used to train foundation LLMs, but that does not fix over-permissive SharePoint sites. ⚠️ Ignoring Guest Access: External users, shared channels, and broad links can widen what Copilot is allowed to ground against. ⚠️ Skipping Data Readiness: Ownerless sites, stale Teams, and over-permissive SharePoint sites become Copilot readiness work. ⚠️ Treating Copilot As Separate: The control plane is still Microsoft 365, Entra ID, SharePoint, Exchange, and Purview. The security story for Copilot is strong when your Microsoft 365 tenant is governed. 🎬 Want more? Explore my newsletter, courses, and more on Microsoft Security, Azure, and AI: https://lnkd.in/eiTnzW8a