Miljödata

Disclosed Aug 25, 20251,500,000 affectedConfirmed

Attack on Swedish municipal IT supplier Miljödata exposes 1.5M people

Miljödata, which supplies IT systems to about 80% of Sweden's municipalities, disclosed on August 25, 2025 that attackers stole data and demanded 1.5 Bitcoin; Sweden's privacy regulator IMY said data on 1.5 million people was exposed and opened investigations.

What is known

People affected	1,500,000 (as reported by the organization)
Disclosed	Aug 25, 2025
Happened	Aug 25, 2025
Attack	Extortion
Data exposed	Dates of birthEmailsGovernment IDsNamesPhone numbersAddressesOther
Sector	Tech · SE
Status	Confirmed
Check your email	Have I Been Pwned

Sources

Aggregatorhaveibeenpwned.com

Have I Been Pwned: Miljödata

Newsbleepingcomputer.com

Data breach at major Swedish software supplier impacts 1.5 million

Regulatorimy.se

IMY inleder granskningar utifran Miljodata-lackan

Notices filed

TotalAug 25, 2025

Research1,500,000 people

Accounts in the dataSep 16, 2025

Have I Been Pwned870,108 people

History of this record

source_type2026-09-25

aggregator to pressby seedSource

source_url2026-09-25

https://haveibeenpwned.com/Breach/Miljodata to https://www.bleepingcomputer.com/news/security/data-breach-at-major-swedish-software-supplier-impacts-15-million/by seedSource

status2026-09-25

disclosed to confirmedby seedSource

verified_by2026-09-25

empty to researchby seedSource

verified2026-09-25

0 to 1by seedSource

country2026-09-25

empty to SEby seedSource

attack2026-09-25

ransomware to extortionby seedSource

data_types2026-09-25

["dob","emails","government-id","names","phone","addresses"] to ["dob","emails","government-id","names","phone","addresses","other"]by seedSource

records_basis2026-09-25

hibp to organizationby seedSource

records2026-09-25

870108 to 1500000by seedSource

disclosed2026-09-25

2025-09-16 to 2025-08-25by seedSource

summary2026-09-25

In August 2025, the Swedish system supplier Miljödata was the victim of a ransomware attack . Following the attack, data was subsequently published on the dark web and included 870k unique email addresses across various compromised files. D to Miljödata, which supplies IT systems to about 80% of Sweden's municipalities, disclosed on August 25, 2025 that attackers stole data and demanded 1.5 Bitcoin; Sweden's privacy regulator IMY said data on 1.5 million people was exposed and opby seedSource

title2026-09-25

empty to Attack on Swedish municipal IT supplier Miljödata exposes 1.5M peopleby seedSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (Have I Been Pwned), confirmed by Research. Record counts are as reported. Not legal advice.

Everything about Miljödata