Last Update: 08/01/2026 at 12:00 PM EST

Data Breach Class Actions Spread

Coverage from Reuters, Bloomberg Law, and others

Articles

25

Active Days

112

The Topic

Data Breach Class Actions Spread topic image

Organizations in the legal, financial, healthcare, and home-security sectors are facing lawsuits after cyber incidents allegedly exposed personally identifiable, financial, or employee data. Complaints commonly assert inadequate safeguards, employee training, multi-factor authentication, or breach notification, while defendants dispute the scope or impact of some incidents. The cases illustrate how cyberattacks are generating continuing legal exposure beyond the initial intrusion, including proposed class actions, demands for stronger controls, and disputes over damages and disclosure timing.

First Article: 04/07/26

Latest Article: 07/27/26

Summary

  • Law firms Wiley Rein and WilmerHale face lawsuits alleging breaches exposed sensitive client, personnel, or customer information.
  • Financial institutions Citizens Bank and Ameriprise are accused of failing to protect records containing Social Security numbers, account details, and other financial data.
  • Complaints repeatedly allege inadequate safeguards, employee training, authentication controls, or timely notification.
  • Reported incidents involve phishing, voice phishing, ransomware, and attacks attributed or linked by complainants to criminal or state-affiliated actors.
  • The litigation seeks damages and improved security practices, but some matters have narrowed or ended without a ruling on the underlying allegations.
  • The scale and sensitivity of exposed data differ substantially across incidents, creating uncertainty about affected populations and actual misuse.

History

07/22/2026

The story now centers more explicitly on a broader set of 2026 U.S. cyber-breach lawsuits, adding Citizens Bank, Ameriprise, and PruittHealth and clarifying allegations about specific attack methods and attribution. The framing also shifts from general privacy-breach litigation to disputes over security controls, notification timing, and whether plaintiffs can show real harm.

07/21/2026

The story has broadened to include more law-firm defendants and a newly recurring investment manager, while the litigation stream remains active with several matters still moving through dismissal or disclosure stages. The main change is a sharper emphasis on client-data breaches and delayed notification across professional services, alongside continued class-action activity.

Full History

Featured

Timeline: 112 Days

Apr 7Apr 28May 19Jun 9Jun 30Jul 21

Additional Articles

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New York Post05-12-2026
A proposed class action in the Southern District of New York alleges Cushman & Wakefield failed to protect client personal data after a vishing-based cyberattack.
CFO Dive07-21-2026
Markishi Wyatt filed a proposed class action in the Southern District of New York alleging Ernst & Young inadequately protected client financial and tax data after unauthorized access to an IT service management platform.
Big4News07-24-2026
In April 2026, Markishi Wyatt filed a proposed class action against EY in New York alleging a third-party platform breach exposed tax-related personal data.
CRE Daily05-15-2026
Michelle Milewski filed a proposed class action in New York after Cushman & Wakefield confirmed a May 5 voice-phishing breach allegedly exposing client data.
American Banker05-15-2026
Kristi Meyers sued Columbia Bank in Seattle after a 7,067-person data breach, alleging Washington breach-disclosure violations tied to a 119-day notice delay.

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Bloomberg Law07-27-2026
Judge Maria A. Lanahan on July 24 allowed a proposed class action against Walsworth Publishing Co. to proceed over a 2024 breach affecting over 100,000 people.
Bloomberg Law06-12-2026
Plaintiffs Beckwith, St. John, and Smith voluntarily dismissed without prejudice their ADT Inc. claims tied to a ShinyHunters voice phishing incident in Florida federal court.
Law360 / Ben Adlin05-14-2026
A Columbia Bank customer filed a proposed class action in Seattle federal court in 2026 over alleged 2025 data breach exposure of unencrypted Social Security and account numbers.
Top Class Actions04-17-2026
Betty Lackey filed a class action in Minnesota alleging Ameriprise failed to secure client PII after a March ShinyHunters ransomware breach.
Top Class Actions05-18-2026
Jillian Russell Hauser filed a class action in Rhode Island federal court on April 22 against Citizens Bank over an alleged April 2026 PII breach involving dark web posting.
Top Class Actions05-27-2026
Latonia James filed a class action in Southern District of Florida alleging ADT failed to secure and disclosed customer PII after a April 20, 2026 network intrusion.
ClassAction.org / Tracy Bagdonas05-15-2026
A proposed US class action filed after ADT's April 2026 breach alleges cybersecurity failures exposed customer PII and inadequate breach notice.
Claim Depot06-25-2026
Columbia Pacific Advisors disclosed a data breach in which an unauthorized third party accessed network systems on or about Nov. 28, 2025, affecting Washington, Massachusetts, and Vermont residents.
Tennessee Bar Association05-28-2026
Florida resident Derrick Burkett sued Washington, D.C. firm Wiley Rein in 2026, alleging delayed detection and notice of a cyberattack leading to dark-web sale of consumer data.
Bloomberg Law News07-15-2026
Jason Perry filed a proposed class action in the US District Court for the District of Columbia against WilmerHale after a May data breach notification on July 10.
Bisnow / Billy Wadsack06-02-2026
Michelle Milewski dismissed a class-action privacy lawsuit against Chicago-based Cushman & Wakefield in the Southern District of New York after an alleged cyberattack involving ShinyHunters and Qilin.
GoLocalProv04-17-2026
A Providence federal class action alleges Hasbro failed to protect employee personal data after a March 28, 2026 breach and delayed breach notification.
The Real Deal05-13-2026
Michelle Milewski filed a proposed class action in the Southern District of New York after a reported ShinyHunters extortion cyberattack exposed client PII at Cushman & Wakefield.
The Real Deal06-03-2026
Michelle Milewski dismissed a Southern District of New York class-action against Cushman & Wakefield after a reported voice-phishing breach exposed PII from 300,000-plus accounts.
WJAR04-16-2026
A class-action lawsuit against Hasbro alleges inadequate disclosure of accessed personal data after an earlier-month data breach in Providence, Rhode Island.
ClassAction.org / Olivia DeRicco04-07-2026
A proposed class action filed in 2025 alleges Opexus failed to prevent a February 2025 insider-driven breach of sensitive federal records and delayed actionable breach notification.
ClassAction.org06-15-2026
Columbia Pacific Advisors disclosed a breach investigation outcome in Washington state, after potential unauthorized access on November 28, 2025 exposed identity, financial, and medical data.