All active MDLs
MDL 2879Data Privacy & Security

Marriott International, Inc., Customer Data Security Breach Litigation

The causation theory in this data breach case involves demonstrating that Marriott's failure to adequately safeguard customer data directly caused injuries such as identity theft and financial fraud. Expert testimony, including that of Dr. Bazelon, has been used to establish that the breach led to specific damages, such as loss of tax revenue for Chicago. The court has admitted such expert opinions, indicating a legally sufficient causal link.

MDU.S. District Judge John P. BaileyMaster docket 8:19-md-2879Source: JPML · Updated March 24, 2026

73

Pending actions

91

Total actions filed

Active

Status

02/06/2019

Established

Who qualifies

Plaintiffs must demonstrate tangible harm resulting directly from the breach, such as evidence of identity theft, financial losses, or significant time spent mitigating damages. Specific evidence of exposure and efforts to mitigate damages within a defined period after the breach is required. The harm must be directly linked to the breach, with recent court rulings emphasizing the need for concrete proof.

Products involved

  • Customer Data (PII, payment card data)

Alleged injuries

  • Identity theft
  • Financial fraud
  • Emotional distress
  • Loss of personal data

This page is generated from the official JPML pending-MDL report and public court records, refreshed monthly. It is provided for attorney reference and is not legal advice.

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