Utair data breach: 401K accounts exposed
Severity: medium · Patch status: no-fix-needed · Since 2025-12-26
In August 2020, news broke of a data breach of Russian airline Utair that dated back to the previous year. The breach contained over 400k unique email addresses along with extensive personal information including names, physical addresses, dates of birth, passport numbers and loyalty program details. Exposed data: dates of birth, email addresses, genders, loyalty program details, names, passport numbers, phone numbers, physical addresses. The breach dates from Mar 21, 2019; Have I Been Pwned loaded it on Dec 26, 2025.
What to do
- If you had a Utair 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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