Security Notice Regarding Booking Data

Communication dated 11/10/2026

What happened

Between 8 and 9 October 2026, a third party gained unauthorised access to the platform of Avantio, the booking management software used by Dolomiti4U and many other accommodation providers. By exploiting a software vulnerability, they were able to view and extract booking data from many properties, including ours. Avantio fixed the vulnerability on 9 October. The breach has been notified to the competent data protection authorities.

Who is affected

Potentially all guests with a Dolomiti4U booking made up to 9 October 2026, including cancelled bookings and past stays. Guests with bookings from 08th October 2026 onwards have also been informed by email.

What data

Name, email address, phone number, date of birth or age, booking details (property, dates, amount, language) and any check-in notes (e.g. pets or extra services).

Not involved: identity documents, photos and payment card data. are not involved.

What to do

  • Do not make payments or enter card details through links received by email, WhatsApp or SMS, even if the message contains correct booking details.
  • Be wary of urgent requests, cancellation threats, refund offers or new bank details.
  • If in doubt, contact us only through the official channels below, never through numbers or links contained in the message.
  • If you have already paid or entered card details, contact your bank immediately, report it to the police and let us know.

Official contact channels

We apologize for the inconvenience.

D4U S.R.L. | Dolomiti4U