Microsoft 365 Copilot: Excel agent enterprise search

🚨 The Signal: Excel Copilot now searches enterprise content (files, emails, chats, meetings) as grounding for responses. This expands the data accessible to the AI agent, increasing potential for data exposure if permissions are misconfigured.

The Impact

All Copilot users are affected, with a high security risk due to expanded AI access to sensitive enterprise data.

  • Copilot users: Risk of sensitive data exposure through AI-generated content.
  • Data owners: Increased need to verify permissions on all enterprise content.
  • Security teams: Enhanced monitoring required for data access patterns by AI agents.
  • Compliance officers: Potential for non-compliance if data handling policies are not updated.

The Action

  1. Review and enforce data classification and sensitivity labels across all M365 content.
  2. Audit existing permissions on SharePoint sites, OneDrive, Exchange mailboxes, and Teams chats.
  3. Implement or refine Microsoft Purview Data Loss Prevention (DLP) policies to detect and prevent sensitive data leakage via Copilot.
  4. Educate users on responsible AI use and the implications of sharing sensitive data with Copilot.
  5. Monitor Microsoft 365 audit logs for unusual data access patterns by Copilot agents.

Domain: Agentic-AI · Impact: high · Workload: M365 Apps