Restricted Content Discovery (RCD) is an important guardrail for Microsoft 365 Copilot deployments. Microsoft is tightening how RCD works to eliminate a corner case where recently accessed files from protected SharePoint Online sites could still surface in Microsoft Search and become available to Copilot. The update closes that loophole by ensuring that recently accessed files from RCD-enabled sites remain hidden from Search and Copilot.
A code error allowed Copilot Chat to expose confidential email. Microsoft is fixing the problem, but it’s a reminder of how AI can expose information of Microsoft 365 tenants don’t use available features to restrict AI access. Those features need to be configured and deployed, but that doesn’t take much effort. It’s better than users complaining when Copilot exposes their most secret thoughts.
Restricted Content Discovery (RCD) is a feature that blocks access by Microsoft 365 Copilot and agents to the files stored in a SharePoint Online site. Instead of relying on tenant administrators, site administrators can now enable or disable RCD. It’s a natural evolution of what is an essential feature to keep sensitive and confidential information being leaked inadvertently by AI.
An article by a company specializing in penetration tests raised some questions about how attackers might use Copilot for Microsoft 365 to retrieve data. The article is an interesting read and reveals how Copilot can reveal data in password protected Excel worksheets. However, many of the issues raised can be controlled by applying available controls, and the biggest worry is lhow the account being used to run Copilot came to be compromised!
Restricted Content Discovery (RCD) is a solution to prevent AI tools like Microsoft 365 Copilot and agents accessing files stored in specific sites. RCD works by setting a flag in the index to stop Copilot attempting to use files. RCD is available to all tenants with Microsoft 365 Copilot and it’s an excellent method to stop Copilot finding and reusing confidential or sensitive information.
