graph api security

Graph API security is a critical concern in modern Microsoft environments, as highlighted by the CoPhish attack technique. This OAuth phishing method exploits Microsoft Copilot Studio to present legitimate-looking sign-in prompts, tricking users into granting OAuth tokens. Once obtained, attackers can use these tokens to access the Microsoft Graph API, enabling account takeover and broad data access without passwords. The attack chain, documented by Datadog Security Labs, underscores governance gaps in Entra ID consent and agent-enabled low-code platforms. Microsoft has acknowledged the issue and is planning updates. For Windows administrators, this reinforces the need to monitor Graph API permissions, enforce consent policies, and educate users about OAuth phishing risks.