Kemper data breach
269,299 accounts exposed in a breach on 15 April 2026.
At a glance
269,299
Accounts exposed
15 April 2026
Date of the breach
28 May 2026
Added to the list
What happened
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
What was exposed
- Email addresses. Email addresses were exposed. Expect more spam and phishing aimed at those addresses.
- Names. Names were exposed. Scammers use real names to make a message look personal.
- Partial credit card data. Part of a payment card number was exposed. On its own it is limited, but scammers use it to sound convincing.
- Phone numbers. Phone numbers were exposed. Expect scam calls and text messages, some of them pretending to be the organisation.
- Physical addresses. Home or postal addresses were exposed. They can be used to make a scam letter or a fake identity look real.
- Purchases. Records of what you bought were exposed. Scammers use them to make messages look genuine.
What to do now
It depends on what was exposed, so these steps follow the list above.
If payment details were exposed
- Check your bank and card statements for charges you do not recognise.
- Tell your bank. Ask about replacing the card or watching the account.
- Be wary of calls or messages that say they are from your bank and ask you to move money or read out a code.
If your contact details were exposed
- Expect more spam, scam calls and phishing. Do not click links or open attachments in messages you did not expect.
- If a message mentions this breach, do not reply. Go to the organisation's own website or app instead of using a link in the message.
Whatever was exposed
- Check which other breaches include your own email address and phone number.
- Keep an eye on your accounts for a few months. Breached data is often used long after the breach.
- If you think someone is using your details, report it to the organisation and to your national cyber crime reporting service.
Check your own exposure
- Password leak check: find out whether a password has appeared in a breach. The password never leaves your browser.
- Free domain security scan: grade the email, DNS and website security of a domain you own.
Related breaches
Other breaches that exposed some of the same kinds of data.
Brinks Home
In July 2026, Brinks Home was targeted in a ShinyHunters "pay or leak" extortion campaign.
- Dates of birth
- Email addresses
- Names
- Partial credit card data
- +3 more
Read what happened
Goose Creek
In June 2026, a party claiming to have access to data from Goose Creek Candle Company sent emails to a number of the company's customers, claiming the company had a…
- Email addresses
- Names
- Phone numbers
- Physical addresses
- +1 more
Read what happened
University of Nottingham
In June 2026, the University of Nottingham was the target of a cyber attack, later linked to a ShinyHunters "pay or leak" extortion campaign.
- Academic records
- Citizenship statuses
- Dates of birth
- Disabilities
- +11 more
Read what happened