Wiz researchers found a single credential that could unlock every database running on Microsoft’s Azure Cosmos DB. They named it the Cosmos Master Key. Cosmos DB is core Azure plumbing, and Microsoft services such as Teams, Entra ID and Copilot all store data in it. The same class of tool that broke into companies this month just helped find a master key to a flagship cloud. This week Wiz aimed them at Azure and found a master key.