A significant data breach occurred at Eurail in December 2025, resulting in the exposure of personal information for 308,777 individuals, including names and passport numbers1. The breach is particularly concerning due to the sensitive nature of the stolen data, which could be used for identity theft and other malicious activities. Eurail has since notified the affected individuals and taken steps to mitigate the damage. The breach was discovered after unusual activity was detected within a segment of the company's network, prompting the implementation of incident response procedures to terminate the activity. The fact that threat actors were able to access and steal sensitive data from Eurail's network raises questions about the company's cybersecurity measures. This breach matters to practitioners because it highlights the importance of robust security protocols to protect sensitive customer information, especially in industries where personal data is heavily relied upon.