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Over the last few years, smartphones have become an omnipresent device that almost everybody owns and carries around all the time. Although financial institutions usually react conservatively to new technologies and trends, most established banks today offer their customers banking apps and app-based second-factor authentication methods. Fintechs, technology startups in the financial sector, pressure the tried and trusted structure of established banks, as they highlight the customer’s smartphone as the hub of their financial life. This business model is especially appealing to younger customers. FinTechs, however, also play an important role in the advancing downfall of important conceptual security measures. While the latter can be understood as the next step in the decay process of second-factor authentication, which was started with the introduction of app-based legitimization methods, FinTechs also reveal limited insights into conceptual and technical security. We have encountered severe vulnerabilities at the Berlin-based FinTech N26, which offers their smartphone-only bank account to many countries throughout Europe. Entirely independent of the used device, we were not only able to reveal N26 customers and to manipulate transactions in real-time but also to completely take over a victim’s bank account.