cs.at Listed by lockbit5 Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
cs.at was listed by the lockbit5 ransomware group on January 25, 2026, after internal files were exfiltrated in a ransomware attack. An undisclosed number of people may have been affected; anyone connected to the organisation should check for official notices and follow any guidance provided.
On January 25, 2026, the ransomware group lockbit5 listed cs.at on its leak site. The entry states that internal files were exfiltrated from CS Pflege & Betreuung, the Austrian care and support provider also known as CS Caritas Socialis. No figure for the number of individuals affected has been released, and the organisation has not yet issued a public statement confirming the scope or authenticity of the listing.
The incident is one of several recent claims involving healthcare and social-service providers. Because the listing remains unverified by independent sources, the precise volume of data and the timeline of any intrusion are still unknown.
Breaking down the breach
The only confirmed detail is the leak-site posting itself. It asserts that files were taken during a ransomware operation, yet it supplies no count of records, no description of file categories, and no indication of whether encryption was also deployed. Public reporting to date contains no evidence of a separate notification from cs.at or from Austrian data-protection authorities.
Until the organisation or regulators release further information, the method of initial access, the duration of unauthorised presence, and the exact data sets remain undisclosed.
The group behind it: lockbit5
LockBit is a ransomware-as-a-service operation that has been active since at least 2019. Its affiliates typically gain entry through phishing, remote-desktop vulnerabilities or compromised credentials, then deploy encryption while also copying selected files for later leverage. The group maintains a public leak site where it lists organisations that have not paid a demanded ransom.
In this case the group claims cs.at as a victim. No independent confirmation of the claim has been published, and the accuracy of the listed material cannot be assessed from the available facts.
cs.at and its sector
CS Pflege & Betreuung provides residential care, home nursing and social-support services in Austria. Organisations of this type routinely process personal data that includes medical histories, care plans, contact details for family members and administrative records required for funding and regulatory compliance.
A successful intrusion at such an entity can therefore expose information that is both sensitive and difficult to replace, even when the precise contents of any exfiltrated files remain unknown.
What data was at risk
The listing refers only to “internal files.” No inventory of document types, databases or personal identifiers has been made public. Consequently it is not possible to state which categories of information were taken or how many individuals are named in them.
The real-world impact
Individuals whose records appear in the exfiltrated material could face risks of identity misuse or unwanted disclosure of health-related information. The organisation itself may incur costs for forensic investigation, regulatory notifications and remediation of any affected systems.
Because the scale of exposure is still unknown, the extent of these consequences cannot yet be quantified.
Were you affected?
Recipients of care or support from cs.at who wish to understand their possible exposure should contact the organisation directly for any official notification. In the absence of further details, monitoring official statements from Austrian data-protection authorities remains the most reliable next step.
- Change passwords for any accounts linked to the organisation and enable multi-factor authentication where available.
- Review bank and insurance statements for unusual activity over the coming months.
- Run a free exposure scan of your email address against known breach data sets to check for prior appearances.
AICompiled with AI assistance from public sources and published under our editorial standards.
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Publicly posted by lockbit5 — 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.