Outlook: Editor (Proofing and Spellcheck)

🚨 The Signal: Outlook now automatically checks spelling and grammar in emails. This feature, while improving productivity, introduces a new vector for data exfiltration or social engineering if not properly managed in sensitive environments.

The Impact

All users are affected, with a low security risk related to potential data exposure or social engineering via proofing suggestions.

• End Users: May inadvertently accept suggestions that alter sensitive data.
• Security Teams: Need to assess if proofing data leaves the tenant or interacts with external services.
• Compliance Teams: Must confirm that data processed by the editor remains within compliance boundaries.

The Action

1. Review Microsoft 365 service documentation for data residency and processing related to Outlook Editor.
2. Communicate best practices to users regarding sensitive information and automated proofing tools.
3. Consider implementing Data Loss Prevention (DLP) policies to prevent sensitive data from being processed by external services, if applicable.

Domain: M365-Apps · Impact: low · Workload: M365 Apps