A recent investigative report has revealed critical cybersecurity concerns in one of the European Union’s key border control systems. The system in question, known as the Second Generation Schengen Information System (SIS II), is a large-scale database used across Europe to track criminal suspects, unauthorized migrants, and missing property. While this system plays a major role in maintaining regional safety, new findings suggest its digital backbone may be weaker than expected.

According to a joint investigation by Bloomberg and Lighthouse Reports, SIS II contains a significant number of unresolved security issues. Though there is no confirmed case of data being stolen, experts warn that poor account management and delayed software fixes could leave the system open to misuse. One of the main issues flagged was the unusually high number of user accounts with access to the database; many of which reportedly had no clear purpose.

SIS II has been in use since 2013 and stores over 90 million records, most of which involve things like stolen vehicles and documents. However, about 1.7 million entries involve individuals. These personal records often remain unknown to those listed until they are stopped by police or immigration officers, raising concerns about privacy and oversight in the event of a breach.

One legal researcher familiar with European digital systems warned that a successful cyberattack could lead to wide-ranging consequences, potentially affecting millions of people across the EU.

Another growing concern is that SIS II is currently hosted on a closed, internal network—but that is about to change. The system is expected to be integrated with a new border management tool called the Entry/Exit System (EES), which will require travelers to provide fingerprints and facial images when entering or leaving countries in the Schengen zone. Since the EES will be accessible online, experts worry it could create a new path for hackers to reach SIS II, making the whole network more vulnerable.

The technical work behind SIS II is managed by a French company, but investigations show that fixing critical security problems has taken far longer than expected. Some fixes reportedly took several months or even years to implement, despite contractual rules that require urgent patches to be handled within two months.

The EU agency responsible for overseeing SIS II, known as EU-Lisa, contracts much of the technical work to private firms. Internal audits raised concerns that management wasn’t always informed about known security risks. In response, the agency claimed that it regularly tests and monitors all systems under its supervision.

As Europe prepares to roll out more connected security tools, experts stress the need for stronger safeguards to protect sensitive data and prevent future breaches.