Explore the intricacies of z/OS penetration testing in this 50-minute conference talk from DefCamp Cluj-Napoca 2024. Senior Penetration Testing Specialist Denis Stepanov delves into the workflow for testing security vulnerabilities on mainframe systems. Learn about the unique challenges and methodologies involved in penetration testing for z/OS, a operating system crucial for many large-scale enterprise environments. Gain insights into the specialized techniques and tools used to assess and improve the security posture of these powerful, legacy computing systems. This presentation, part of the first spin-off edition of Central and Eastern Europe's premier hacking and cybersecurity conference, offers valuable knowledge for cybersecurity professionals, mainframe specialists, and anyone interested in the intersection of modern security practices and traditional enterprise computing.