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Tested the raw socket layer of a pre-production POS system. Found 4 critical/high vulnerabilities — including a replay attack, cross-merchant IDOR, ghost transactions, and card identity bypass
https://m4kr0.vercel.app/posts/iso-8583-under-fire-finding-vulnerabilities-in-a-payment-socket
M4KR0 Blog ISO 8583 Under Fire: Finding Vulnerabilities in a Payment Socket - M4KR0 Blog A hands-on walkthrough of security testing an ISO 8583 payment socket — from reversing the app and enabling hidden debug mode, to finding four critical vulnerabilities in the processor layer
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