OAuth permissions are the silent back door of modern SaaS, and with the rise of remote MCP servers, that back door is only getting wider. Every time an employee clicks “Sign in with Google” or connects an AI agent to a new MCP server, another vendor obtains the key to the data, often without IT or security involvement. Most of these grants are low risk. Some people don’t. This checklist provides a repeatable way to differentiate between tolerances before they turn into incidents.
What you’ll learn: When to perform OAuth investigations and which grants deserve the most scrutiny The four pillars of evaluating every grant: Scope and permissions, app registration details, vendor trust signals, app popularity and usage Red flags that separate legitimate integrations from over-the-top malicious integrations Differences between MCP server connections and where to apply additional checks A decision matrix for what to keep, what to restrict, and what to revoke This guide is for:
Security leaders, IT administrators, and GRC personnel who need a repeatable way to evaluate OAuth permissions and MCP server connections before they become supply chain risks.
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