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Cloudflare Billing Logic Flaw: Bypassing Premium Subscriptions via Request Replay While reverse-engineering Cloudflare’s subscription system, I discovered an interesting “gap” between the frontend checkout logic and the backend state synchronization. By using a specific request replay technique, it is possible to trick the backend into activating the Pro or Business plan without the system generating an actual bill. 01. Core Behavior: A “Quantum Superposition” of Identity and Permissions This bypass method places the account in a peculiar state of misalignment: ...