The Basic-Fit 2026 data breach involved unauthorized access to a system that recorded member visits to the fitness chain's clubs. According to the company's official April 13, 2026 release, monitoring detected the access and it was stopped within minutes of discovery. An investigation by external security specialists confirmed that the intruder downloaded some member data stored in the system.
Basic-Fit initially announced that approximately 200,000 active members in the Netherlands were affected. The company then directly confirmed to SecurityWeek that roughly one million members were impacted across countries including the Netherlands, Spain, Germany, France, Belgium, and Luxembourg. LeakData therefore uses the approximate global count of 1,000,000; the Dutch figure is a subset.
Confirmed Types of Data
The downloaded information included membership information, name and address details, email addresses, phone numbers, dates of birth, and bank-account details. Fields may differ by person and country; the notice does not say that every member had every item exposed. The data classes in this record are limited to the information named in the official company release.
Basic-Fit expressly stated that it does not hold members' identity documents and that no passwords were accessed. Passports, identity cards, and passwords are therefore excluded from the data classes. Even without a password, the combination of identity, contact, birth-date, and bank information provides enough context for targeted phishing and direct-debit fraud.
Access to the Member-Visit System
The breach affected the system used to record member visits to Basic-Fit clubs. The company confirmed only that “some data” stored in that system was downloaded and named the affected membership and contact fields. It did not separately state that every member's detailed gym-visit history was stolen, so this entry does not invent location or visit history as an independent data class.
Company monitoring detected the unauthorized access, which was cut off within minutes. The short access window did not prevent actual data loss; forensic work showed that a download occurred. This distinction matters: the event was not merely a failed attack attempt but a company-confirmed breach in which members' personal information left the system.
Countries and Affected-Member Count
Basic-Fit's first press release counted approximately 200,000 people in the Netherlands and said active members in other countries were also involved. SecurityWeek updated its reporting after direct confirmation from the company that the overall figure was roughly one million and identified Spain, Germany, France, Belgium, and Luxembourg among the additional affected countries.
One million is an approximate scope, not a precise row total. The company also did not say that all Basic-Fit members were affected; it had millions of memberships when the event was disclosed. Active members who receive a direct notice should treat their information as involved, while others can seek confirmation through the official support channel according to their country and membership status.
Bank-Account and Phishing Risk
A bank-account number is not an online-banking password, but it can support fraudulent direct-debit requests, refund scams, and convincing bank impersonation. Review statements for unfamiliar debits, enable transaction notifications, and report suspicious activity to the bank promptly. Decide whether the account needs replacement only through the financial institution's official channel.
An attacker could use a real name, birth date, phone number, and membership detail to impersonate Basic-Fit staff. Do not follow links claiming “your fee will be refunded,” “verify your bank account,” or “close the affected membership.” Open the Basic-Fit application or site yourself and never give a caller a one-time code, banking login, or full payment-card details.
Basic-Fit's Response
The company said it notified the relevant data-protection authority, informed affected members, and investigated with outside security specialists. At the time of the first review, it had found no evidence that the data was available publicly or had been misused. Basic-Fit continued monitoring with specialists; no observed misuse at that moment does not guarantee that the information cannot be used later.
Because the company confirmed that passwords were not accessed, the incident itself is not a password leak. If you entered a Basic-Fit password through a link in a suspicious message, however, change it through the official application and separate any other account using the same value. Report unfamiliar contact details, membership changes, or transactions with screenshots and timestamps.
How to Interpret This LeakData Record
The 1,000,000 value is Basic-Fit's approximate total directly confirmed to SecurityWeek; the 200,000 Dutch members are included and are not added again. No individual member rows were imported into LeakData, so the absence of an email-search result cannot override a direct Basic-Fit notification.
This entry covers only the member-visit system incident disclosed in April 2026. Passwords and identity documents are marked as unaffected, and undisclosed visit history is not added as a data class. If Basic-Fit later publishes an exact person count, intrusion date, new country, or additional data type, the record should be updated only to match that verified evidence.
