---
title: "Data breach at Waltio"
description: "Waltio, a French crypto-asset tax platform, informed its users on September 15, 2026 of unauthorized access to its account with Brevo, its email-sending provider, as part of a security incident suffered by that provider on September 10, 2026. The company says it does not yet know whether its contact"
canonical: https://inyourgeek.com/en/fuites-de-donnees/2026-09-15-waltio
type: fuite-de-donnees
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-15
dateModified: 2026-09-15
---
# Waltio

Data breach — Moderate

Waltio, a French crypto-asset tax platform, informed its users on September 15, 2026 of unauthorized access to its account with Brevo, its email-sending provider, as part of a security incident suffered by that provider on September 10, 2026. The company says it does not yet know whether its contact list was viewed or exported; if it was, the exposed data would be limited to the account's email address and, for some users, their department number. Waltio states that this tool held no passwords, API keys, wallet addresses, or tax or transaction data. This incident is distinct from a prior breach Waltio acknowledged in January 2026.

The potentially exposed contact details could be used to target Waltio users with more credible phishing messages, in a crypto-asset sector already targeted by such campaigns following the Brevo incident.

| Fact | Value |
| --- | --- |
| Disclosed on | September 15, 2026 |
| Incident dated | September 10, 2026 |
| Sector | Digital services |
| Country | France |
| Cause | Third-party provider |
| Severity | Moderate |
| Status | Confirmed |

## Exposed data

- Email address
- Other personal data

## What you can do

- Expect phishing attempts quoting your name and this company. A message that knows your details is not legitimate for that reason.
- You can ask the organisation exactly what was exposed about you (right of access), and complain to the DPA if no answer comes within a month.

## Sources

- [Waltio : fuite de données après un accès non autorisé à son compte](https://fuitesinfos.fr/article/2026-09-15-waltio) — Fuites Infos
- [Waltio Confirms Brevo Breach Touched Its User Emails: Here Is What To Do Now](https://cryptoticker.io/en/waltio-brevo-breach-user-emails-exposed/) — Cryptoticker
- [Questions & Answers - Security Incident](https://help.waltio.com/en/articles/13482134-questions-answers-security-incident) — Waltio Help Center
- [Waltio frappé par une violation de données et une tentative d'extorsion](https://cryptoast.fr/waltio-frappe-violation-donnees-tentative-extorsion/) — Cryptoast

_Entry built from the cited sources after a corroboration check, then reviewed before publication._

---

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