Every public data breach

44 disclosed this week · 26,355 on record

Kemper

Disclosed May 28, 2026269,299 accountsUnverified

In April 2026, the American insurance holding company Kemper Corporation was named by the ShinyHunters ransomware group in a "pay or leak" extortion campaign . The attackers allegedly accessed Kemper's Salesforce environment via social engineering as part of a broader campaign targeting hundreds of organisations using the same method. The group later published tens of gigabytes of data they claimed included internal directory data, Salesforce records and Stripe payment logs. Among the 269k unique email addresses were names, phone numbers, physical addresses and partial payment card data includ

What is known

People affected269,299 (accounts in the leaked data, per Have I Been Pwned)
DisclosedMay 28, 2026
HappenedApr 15, 2026
AttackRansomware
Data exposedEmailsNamesPayment cardsPhone numbersAddressesFinancial
SectorTech
StatusUnverified: not yet confirmed by an official notice, a filing or the organization
Check your emailHave I Been Pwned

Sources

Notices filed

History of this record
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (Have I Been Pwned). Record counts are as reported. Not legal advice.

Everything about Kemper