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A critical OAuth redirect flaw has been identified in an airline travel integration service, potentially exposing millions of users to account hijacking. By exploiting this flaw, attackers can gain unauthorized access to user accounts and perform actions like impersonating victims, modifying bookings, and accessing personal information. The vulnerability highlights the importance of robust OAuth implementation and thorough security testing within travel service platforms. This incident underscores the need for organizations to secure their APIs and ensure adequate security controls against account takeovers.