Questel data breach: 1.2M accounts exposed
Severity: medium · Patch status: no-fix-needed · Since 2026-09-01
In August 2026, the French intellectual property software and services company Questel was the target of a ShinyHunters "pay or leak" extortion campaign. The group subsequently published an extensive corpus of data they alleged was obtained from the company, largely comprising corporate contact information associated with sales leads, support cases and marketing activities, with 1.2M unique email addresses. The data also included names, employers and job titles, along with physical addresses and phone numbers. Exposed data: email addresses, employers, job titles, names, phone numbers, physical addresses, support tickets. The breach dates from Aug 1, 2026; Have I Been Pwned loaded it on Sep 1, 2026.
What to do
- If you had a Questel account, change its password and the password of any other account that reused it.
- Turn on multi-factor authentication wherever it is offered.
- Check whether your addresses are in this breach at https://haveibeenpwned.com.
- Expect targeted phishing that quotes the leaked details; verify any unexpected contact out of band.
Sources
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