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Liberty Mutual Faces Class Action Over Ransomware Data Breach Exposing Customer Data

Liberty Mutual Faces Class Action Over Ransomware Data Breach Exposing Customer Data

First seen 19 May 2026, 21:19 UTC

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ThreatCluster AI
ThreatCluster May 20, 2026 at 21:14 UTC
  • Liberty Mutual is accused of failing to protect sensitive customer data during a ransomware attack.
  • The ransomware group Everest is linked to the breach, with data potentially exposed on the dark web.
  • Plaintiffs report identity theft and fraud incidents following the data breach.

Liberty Mutual Insurance is facing a class action lawsuit due to a ransomware attack that exposed sensitive information of over 15,000 policyholders. The plaintiffs allege that the criminal group Everest accessed and may post their personally identifiable information and protected health information on the dark web. They claim that Liberty Mutual failed to encrypt or redact this sensitive data, leading to negligence and various legal violations. The lawsuit seeks to represent a nationwide class and a Massachusetts subclass of affected consumers. Plaintiffs have reported experiencing identity theft and fraud following the breach. The case is filed in the U.S. District Court for the District of Massachusetts, with plaintiffs demanding a jury trial and various forms of damages.

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Timeline

2026-05-19
Class action lawsuit filed against Liberty Mutual
Plaintiffs allege negligence in protecting sensitive data after a ransomware attack by Everest, affecting over 15,000 policyholders.
Topclassactions
2026-05-19
Details of the ransomware attack revealed
The plaintiffs claim that Everest added Liberty Mutual to its dark web leak site, exposing sensitive medical records and personal information.
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