Bypassing CORS configurations to produce an Account Takeover for Fun and Profit

The bug that is being written about here is from an previous bug bounty engagement for a major telecommunication company. This bug consists of a CORS misconfiguration that isn’t commonly a misconfiguration unless certain conditions are met. First for individuals who aren’t familiar with CORS technology, CORS stands for Cross Origin Resource Sharing and is a common method to bypass SOP for developers in order to retrieve information across multiple domains. CORS works by facilitating certain headers in the initial …

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