---
title: "Data breach at JIMS"
description: "JIMS, a gym chain notably present in Belgium, confirmed in July 2026 that it had suffered a computer system intrusion, followed by a phishing campaign targeting its members with a fake payment-method update email. In September 2026, a post on a data-trading forum claimed possession of a database cov"
canonical: https://inyourgeek.com/en/fuites-de-donnees/2026-09-22-jims
type: fuite-de-donnees
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-22
dateModified: 2026-09-22
---
# JIMS

Data breach — Critical

JIMS, a gym chain notably present in Belgium, confirmed in July 2026 that it had suffered a computer system intrusion, followed by a phishing campaign targeting its members with a fake payment-method update email. In September 2026, a post on a data-trading forum claimed possession of a database covering 150,000 members, with a 1,000-record sample containing names, dates of birth, addresses, emails, phone numbers, customer IDs and banking details (IBAN, BIC).

The exposed data (identity, contact details, IBAN) enables targeted phishing and banking fraud attempts, as already seen in the campaign targeting JIMS members.

| Fact | Value |
| --- | --- |
| Disclosed on | September 22, 2026 |
| Accounts affected | 150,000 |
| Sector | Retail |
| Country | Belgium |
| Cause | Undisclosed |
| Severity | Critical |
| Status | Confirmed |

## Exposed data

- Email address
- Full name
- Phone number
- Postal address
- Date of birth
- Customer ID
- Banking data (IBAN, card)

## What you can do

- Expect phishing attempts quoting your name and this company. A message that knows your details is not legitimate for that reason.
- Watch your statements. On any unknown debit, block the card and request a refund — French law (art. L133-18) entitles you to it.
- You can ask the organisation exactly what was exposed about you (right of access), and complain to the DPA if no answer comes within a month.

## Sources

- [JIMS](https://frenchbreaches.com/alertes/jims-mucy4j69k4im0qnlul) — FrenchBreaches
- ["Mettez à jour votre moyen de paiement" : des clients de JIMS ciblés par un faux mail après une intrusion](https://www.lalibre.be/economie/mes-finances/2026/07/24/mettez-a-jour-votre-moyen-de-paiement-des-clients-de-jims-cibles-par-un-faux-mail-apres-une-intrusion-ZS62PASTDRGJREOIEQCWF2XE54/) — La Libre

_Entry built from the cited sources after a corroboration check, then reviewed before publication._

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