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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Basic-Fit said on 13 April 2026 that unauthorized access to the system recording visits to its clubs led to the download of some member information. The company initially reported about 200,000 affected members in the Netherlands; it later confirmed to SecurityWeek that approximately 1 million members were affected across its markets.
What Basic-Fit disclosed
Basic-Fit said its monitoring detected the unauthorized access and that the company stopped it within minutes of discovery. The system involved records members’ visits to Basic-Fit clubs. An investigation by external security experts found that some stored information had been downloaded.
The company did not identify the intruder, explain how access was obtained, or say whether the access method had been completely eliminated.
What information was downloaded?
Basic-Fit said the affected records could include:
- Membership information
- Names and addresses
- Email addresses
- Phone numbers
- Dates of birth
- Bank account details
Basic-Fit also said it does not hold members’ identity documents and that no passwords were accessed. Those are statements about the company’s findings and systems, not a guarantee that no other information could be involved in a later development.
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How many members and which countries?
The figures were disclosed in stages. Basic-Fit’s announcement cited around 200,000 affected members in the Netherlands. SecurityWeek reported on 14 April 2026 that Basic-Fit directly confirmed an approximate total of 1 million affected members overall, including members in Spain, Germany, France, Belgium and Luxembourg.
| Scope | Reported figure | Source and qualification |
|---|---|---|
| Netherlands | About 200,000 members | Basic-Fit’s 13 April 2026 announcement |
| Overall | Approximately 1 million members | Basic-Fit confirmation reported by SecurityWeek on 14 April 2026 |
Basic-Fit describes its business as operating more than 2,150 clubs in 12 countries with more than 5.8 million memberships. “Memberships” is the company’s term and should not be treated as a count of unique people; some individuals may hold more than one membership.
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Were bank details or passwords stolen?
Bank account details were among the categories Basic-Fit said were included in the downloaded information. The company said no passwords were accessed and that it does not hold member identity documents. The disclosure does not establish whether every affected record contained every listed data category.
What Basic-Fit has confirmed about its response
Basic-Fit said it:
- Detected and stopped the unauthorized access through its monitoring processes.
- Used external security experts to investigate.
- Notified the relevant data protection authority.
- Informed members whose data was involved.
Basic-Fit said its investigation had not shown the data to be available elsewhere or misused at the time of its announcement. That is the company’s contemporaneous finding, not independent proof that misuse did not occur later or cannot occur in the future.
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What remains unknown
- Who carried out the intrusion.
- How the attacker gained access.
- Whether the access route was fully closed and eradicated.
- Whether any later publication, misuse or regulator finding will emerge.
The available announcements do not provide a named attacker, a technical attack description or a subsequent regulatory outcome.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.The Bottom Line
Basic-Fit says an intrusion led to the download of member records, including contact, membership, birth-date and bank-account information, while passwords and identity documents were not accessed. The company reported about 200,000 affected members in the Netherlands and confirmed an approximate total of 1 million across several European countries; the attacker and any later misuse remain unresolved.
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