MUST Informatique Listed by thegentlemen Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
MUST Informatique was listed by thegentlemen ransomware group on February 24, 2026, after internal files were exfiltrated in a ransomware attack. Individuals should check whether their data may have been exposed and take appropriate protective steps.
Breaking down the breach
Public reporting on the incident is limited to the group’s leak-site listing. The facts state that internal files were exfiltrated during a ransomware attack, but no further details on the date of the intrusion, the volume of data, or the specific techniques used have been disclosed. The number of individuals affected is recorded as unknown.
Who is thegentlemen?
Thegentlemen is a ransomware group that maintains a leak site where it lists organizations it claims to have targeted. In this case the group claims responsibility for the MUST Informatique incident through that listing. No independent confirmation of the claims or additional details about the group’s actions in this specific case have been made public.
Who is MUST Informatique?
MUST Informatique is a French software publisher founded in 1990 and based in Couzeix, France. It develops digital solutions for home healthcare providers, covering areas such as home care, respiratory assistance, orthopedics, and infusion therapy. The company’s software supports patient-data management, regulatory compliance, and process digitization for healthcare professionals. It reported approximately €10 million in annual revenue and was acquired in 2024.
What was likely exposed
The only data type named in available reports is internal files exfiltrated during the ransomware attack. The exact contents of those files have not been disclosed. Organizations of this type routinely hold operational records, client information, and patient-related data processed through their software, but the precise categories involved in this incident remain unconfirmed.
Why it matters
Healthcare software providers store and process sensitive operational and patient information. Any confirmed exposure of internal files could affect the organizations that rely on the software for daily compliance and care coordination. For individuals, the practical consequences depend on the nature of the files that were taken, which is not yet known.
If your data was in this claimed breach
Monitor accounts linked to any services that use MUST Informatique software and watch for unusual activity. Enable multi-factor authentication where available and review privacy settings on healthcare-related platforms. Readers can run a free exposure scan of their email address against known breach data to check for appearances in public records.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
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Publicly posted by thegentlemen — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.