Microsoft warned that the hacking group ShinyHunters abused OAuth in SaaS environments to gain persistent access through malicious applications. The company described attacks that rely on user or administrator consent to grant high value permissions, allowing access to email, files, calendars, and directories without using passwords. Microsoft advised limiting who can register applications, requiring administrator approval for risky scopes, preferring publisher verified apps, and applying Conditional Access to consent flows. Detection steps include auditing Enterprise Applications, reviewing OAuth consent logs and token usage, and removing malicious service principals while revoking tokens. Founders should inventory third party integrations, enforce least privilege scopes through centralized approvals, and require security commitments from vendors. Training employees on consent prompts and running incident exercises help strengthen response and reduce business risk.
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