Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Sam's Club

Disclosed Mar 28, 2025Unverified

Clop lists Sam's Club on leak site; retailer investigates

Sam's Club said it was investigating reports of a potential security incident after the Clop gang added it to its leak site amid Cleo-related extortion; Clop did not publish proof.

What is known

People affectedNot stated in the sources we have
DisclosedMar 28, 2025
AttackExtortion
Data exposedNot stated
SectorRetail · US
StatusUnverified: not yet confirmed by an official notice, a filing or the organization
Part ofCleo (2024)

Sources

Newsbleepingcomputer.com
Retail giant Sam's Club investigates Clop ransomware breach claims

Notices filed

TotalMar 28, 2025
ResearchCount not stated

Same campaign

HertzCleo zero-day breach exposes Hertz customers' licenses and card dataSupply chain1.2M affectedTransportUSApr 11, 2025WK KelloggSupply chain exposed names, Social Security numbers and employment records. Reported to the Indiana AG.Supply chain4,093 affectedManufacturingUSApr 4, 2025Western Alliance BankCleo zero-day breach exposes 21,899 Western Alliance Bank customersSupply chain22K affectedFinanceUSMar 14, 2025

Other breaches at Sam's Club

Hacking breachHacking exposed names and credentials and tokens. Reported to the California AG.286K affectedNonprofitUSOct 21, 2020
History of this record
Added2026-09-25
First recordedby seedSource

First seen 2026-09-25 (Research). Record counts are as reported. Not legal advice.

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