---
title: "Data breach at Miljödata"
description: "In August 2025, Miljödata suffered a data breach. 870,108 accounts were affected. The exposed data includes dates of birth, email addresses, identity documents, names, phone numbers and postal addresses."
canonical: https://inyourgeek.com/en/fuites-de-donnees/2025-08-25-miljodata
type: fuite-de-donnees
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2025-09-16
dateModified: 2025-09-16
---
# Miljödata

Data breach — Critical

In August 2025, Miljödata suffered a data breach. 870,108 accounts were affected. The exposed data includes dates of birth, email addresses, identity documents, names, phone numbers and postal addresses.

| Fact | Value |
| --- | --- |
| Disclosed on | September 16, 2025 |
| Incident dated | August 25, 2025 |
| Accounts affected | 870,108 |
| Sector | Public sector |
| Country | Sweden |
| Cause | Undisclosed |
| Severity | Critical |
| Status | Confirmed |

## Exposed data

- Date of birth
- Email address
- Identity document
- Full name
- Phone number
- Postal address

## 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.
- These documents enable identity theft, and cannot be reissued at will. Keep the notification letter: it proves where the leak came from if an account is opened in your name.
- 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

- [Have I Been Pwned — Miljödata](https://haveibeenpwned.com/Breach/Miljodata) — Have I Been Pwned (CC BY 4.0)
- [Sweden fines Miljödata $183,000 over breach affecting 2.2 million](https://www.bleepingcomputer.com/news/security/sweden-fines-milj-data-183-000-over-breach-affecting-22-million/) — Bleeping Computer
- [Personal data breach following unauthorized access at Miljödata](https://start.stockholm/en/news-and-calendar/news/2025/09/personal-data-breach-following-unathorized-access-at-miljodata/) — Ville de Stockholm
- [Miljödata får betala miljonavgift efter gigantiska läckan](https://computersweden.se/article/4224839/miljodata-far-betala-miljonavgift-efter-gigantiska-lackan.html) — Computer Sweden
- [Miljödata får böta 1,8 miljoner efter dataintrånget](https://techtidningen.se/miljodata-far-bota-18-miljoner-efter-dataintranget/) — Techtidningen
- [Miljödata: böter efter jätteläcka](https://upphandling24.se/miljodata-boter-efter-jattelacka/) — Upphandling24
- [Experten: En miljon svenskars personuppgifter publicerade på darknet](https://www.svt.se/nyheter/inrikes/experten-en-miljon-svenskars-personuppgifter-publicerade-pa-darknet) — SVT Nyheter

_Entry built from Have I Been Pwned’s structured data, with no model rewriting._

---

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