The Red Agent POV: The One Boolean That Broke a B2B Platform’s Credit System

A business-logic flaw in a B2B platform's data API allowed unauthorized access to premium contact data without spending credits. The vulnerability stemmed from the backend trusting a client-controlled boolean flag 'unmaskContactData' without validating user entitlements. This enabled free-tier users to bypass paywall restrictions and extract unmasked business emails, phone numbers, and personal information at scale. The flaw highlights a critical gap in server-side authorization enforcement, which traditional security tools failed to detect.

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