Platform & Architecture

Azure MCP Server SSRF and Credential Relay: Six Services That Carry a Managed Identity Token Wherever the Request Points

At DEF CON 34 Cloud Village on August 8, 2026, Marios Gyftos and Chrysostomos Manousis presented credential relay findings across six Azure services, including Azure AI Foundry, Azure AI Speech, Azure MCP Servers, AKS MCP and API Management. The root cause is one sentence long: the credential attached to an outbound request and the destination of that request are resolved independently, and nothing checks that they belong together. This piece walks the mechanism, separates the part Microsoft owns from the part a policy gateway owns, and sets out the record an incident reviewer needs.