DentaQuest data breach: 2.6M accounts exposed
Severity: medium · Patch status: no-fix-needed · Since 2026-06-03
In May 2026, the dental benefits administrator DentaQuest was the target of a ShinyHunters "pay or leak" extortion campaign that resulted in the group publicly publishing hundreds of gigabytes of data allegedly obtained from the company. The data included 2.6M unique email addresses along with names, addresses and phone numbers. Much of the data appeared in healthcare enrollment files ( ASC X12 transaction sets ) with some containing Medicaid IDs, while additional data appeared in member records and related files. DentaQuest acknowledged "a cybersecurity incident involving unauthorized access to a limited portion of our network", and advised they had contained the attack and mitigated the threat. Exposed data: dates of birth, email addresses, genders, government issued ids, health insurance information, names, phone numbers, physical addresses. The breach dates from May 23, 2026; Have I Been Pwned loaded it on Jun 3, 2026.
What to do
- If you had a DentaQuest 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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