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I tested ChatGPT’s backend API using RENTGEN, and found more issues than expected

@kala ・ Dec 02,2025

I tested ChatGPT’s backend API using RENTGEN, and found more issues than expected

A closer look at OpenAI’s API uncovers some shaky ground: misconfigured CORS headers, missing X-Frame-Options, no input validation, and borked HTTP status handling. Large uploads? Boom..crash! CORS preflight requests? Straight-up denied. So much for smooth browser support.

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