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Phishing Service Greatness Exploits RingCentral to Target Microsoft 365 Accounts

A recent security bulletin from RingCentral may have inadvertently given hackers a blueprint for a phishing campaign, as a notorious phishing service known as Greatness has begun targeting Microsoft 365 accounts with sophisticated attacks. Greatness, a phishing-as-a-service platform, has upgraded its tactics to include advanced threats like adversary-in-the-middle attacks and device-code phishing flows.