Kevin St-Arnaud v. Integrated University Health and Social Services Centre of South-Central Montreal

CIUSSS EMPLOYEES’ PERSONAL AND BANKING INFORMATION EXPOSED THROUGH AN INTERNAL EXCEL FILE DISCLOSURE: A BREACH OF QUEBEC PRIVACY RIGHTS AND PUBLIC-BODY DATA PROTECTION OBLIGATIONS.

This class action seeks compensation for all current and former employees of the Centre intégré universitaire de santé et de services sociaux du Centre-Sud-de-l’Île-de-Montréal (CIUSSS) whose personal and/or financial information was contained in a payroll Excel file that was mistakenly shared with unauthorized internal staff between April 29, 2019 and December 11, 2025.

Latest update

On January 19, 2026, the Plaintiff filed an Application for Authorization to Institute a Class Action and to be Appointed as Representative Plaintiff before the Superior Court of Québec. The class action seeks, among other remedies, moral and compensatory damages for stress, anxiety, inconvenience, loss of control over personal information, as well as punitive damages to sanction the privacy violation and prevent similar misconduct from happening again.

Eligibility criteria

You may be included in this class action if you meet the following criteria: You are a current or former employee of the CIUSSS du Centre-Sud-de-l’Île-de-Montréal. Your personal and/or financial information was contained in the payroll Excel file involved. You were affected by the confidentiality incident that occurred between April 29, 2019 and December 11, 2025.

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You may register to receive updates about this class action. We will keep you informed of major developments. For more information on how to become a member of a class action, please consult our section What is a class action?

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If you wish to be kept informed about news or updates regarding Twin Lisbet Inc., please complete the form below. Your name will be added to our contact list to receive relevant communications. By filling out and submitting this form to Twin Lisbet Inc., no attorney-client relationship is created. The information you provide will be handled carefully and in accordance with our Privacy Policy and Terms of Use.

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Are you a current or former employee of the CIUSSS du Centre-Sud-de-l’Île-de-Montréal whose personal and/or banking information was exposed through the payroll Excel file that was mistakenly shared internally?

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I understand that this form does not constitute a claim in a class action. The information provided here will be used by Twin Lisbet to keep me informed about the progress of the class action. I understand that it is my responsibility to inform the firm of any changes to my contact information.

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