Webhook Signature Verification Alone Does Not Guarantee Request Authorization

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Verifying an HMAC webhook signature only confirms that a payload originated from a vendor, not that the request is authorized to modify specific resources in your system. Developers must separately map incoming events to internal subjects and apply proper authorization checks — covering tenant, user, and resource — before executing any side effects. A correctly signed payload can still contain a spoofed tenant ID or an action the customer never permitted. Network trust and cryptographic authenticity do not substitute for a defined authorization policy. Experts recommend evaluating subject, action, and resource before mutating any system state.

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ProgrammingDEV Community ·

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