Europe’s largest budget fitness chain by club count, Basic-Fit, has confirmed a significant data breach affecting approximately 1 million members across multiple countries, with around 200,000 members in the Netherlands alone impacted by unauthorized access to its membership systems.

Basic-Fit, which operates over 2,150 gyms across 12 European countries and serves more than 4.5 million members, detected the intrusion through its internal system monitoring tools.

According to the company, the unauthorized access was stopped within minutes of detection, but not before threat actors had already downloaded a significant volume of member data.

The breach specifically targeted the system Basic-Fit uses to register member visits at its fitness clubs, not its broader infrastructure.

Basic-Fit’s franchise operations across six additional countries rely on a separate, independent system and have been confirmed as unaffected by the incident.

Basic-Fit Data Breach

The compromised data encompasses a wide range of sensitive personal information. Affected members had the following data exposed:

Full names and home addresses
Email addresses and phone numbers
Dates of birth
Bank account details
Membership information, including subscription type, subscription number, payment status, and recently visited gym locations

Basic-Fit confirmed that no identity documents, such as passports or driving licenses, are stored within the affected system, and that no passwords were accessed during the breach. The company has also stated that, as of now, there are no indications that the leaked data has been misused, Reuters reported.

In compliance with GDPR obligations, Basic-Fit has formally notified the Dutch Data Protection Authority (Autoriteit Persoonsgegevens) of the breach.

The company operates its headquarters in Hoofddorp, Netherlands, making the Dutch regulator its lead supervisory authority under EU data protection law. All affected members have reportedly been directly informed about the incident.

This breach follows a wave of major data incidents in the Netherlands in 2026, including telecom firm Odido’s exposure of 6.2 million customers’ records, including IBAN numbers and identity documents.

Exposing bank account details alongside full contact information significantly increases the risk of phishing, social engineering, and financial fraud targeting affected individuals.

Cybersecurity experts recommend that impacted Basic-Fit members remain vigilant for suspicious emails or calls requesting further personal or financial information, monitor bank statements closely for anomalies, and exercise heightened caution with unsolicited communications referencing their gym membership.

Basic-Fit has not disclosed the identities of the threat actors responsible for the intrusion, and investigations remain ongoing.

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