How a Single Exposed File Led to Critical Bank System Compromise

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What begins as a seemingly harmless configuration oversight can rapidly evolve into a full-scale security crisis. During an internal penetration testing engagement for a leading banking institution, Ampcus Cyber uncovered a critical attack path that originated from an exposed internal resource and escalated far beyond what anyone anticipated.

The assessment revealed how a chain of interconnected weaknesses could potentially provide attackers with access to sensitive banking environments, exposing organizations to risks that extend well beyond data loss. The findings demonstrated how gaps in internal security controls, credential management, and access governance can create opportunities for significant operational and financial impact.

With a CVSS score of 10.0 (Critical) and multiple backend systems affected, this case study provides a real-world perspective on how sophisticated compromises do not always begin with advanced exploits. Sometimes, all it takes is a single overlooked file.

Download the full case study to explore the attack progression!

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7th August 2026

New Delhi, India

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Ampcus Cyber
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