Miljödata 2025 Data Breach
Company · Environmental and data services · Sustainability data provider · Sweden
Miljödata Swedish Occupational Health Software Breach (2025): 870K Records Including Swedish Government ID Exposed via Ransomware
Swedish software provider focused on occupational health, rehabilitation, and workplace environment management.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
69/100
Lower riskHigher risk
High and current: recent, valuable data circulating on the dark web now.
Data Sensitivity i
ElevatedExposed data raises the risk of fraud, targeting, and impersonation. Proactive steps are warranted.
870KRecords
2025Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Crucial data exposed
Gov IDGovernment ID
AddressPhysical address
Breach Summary
Swedish IT supplier Miljödata was hit by a ransomware attack discovered on Saturday, August 23, 2025. The intrusion compromised systems the company operates on behalf of a large share of Sweden's public sector, including its Adato platform for occupational-health and HR workflows. The attackers reportedly demanded 1.5 bitcoin, equivalent to roughly €144,000.\n\nThe blast radius was unusually wide for a single supplier breach. Approximately 164 municipalities, four regions, multiple universities, and a number of private firms were directly affected, totaling around 250 client organizations. In mid-September 2025, attackers published stolen data on the dark web. The dataset covered roughly 870,000 unique email addresses paired with names, phone numbers, physical addresses, dates of birth, gender, and Swedish personal identity numbers, also known as personnummer.\n\nThe exposure carries severe and durable risk for affected Swedes. The personnummer is a stable government identifier used widely for identity verification, banking, healthcare, and tax purposes, and combined with name and date of birth it is a strong base for identity-verification bypass and account takeover. Health-context records including medical certificates, rehabilitation plans, and work-injury documentation may also have been compromised. Anyone notified by their employer or municipality should treat their personnummer as exposed, monitor for unusual financial activity, and exercise heightened caution with unsolicited contact referencing health, payroll, or government-service matters.
Full threat analysis, exploitation vectors, and principal guidance below.
10 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
870K records analyzed
About Miljödata
Miljödata is a Swedish software supplier that builds and operates IT systems for occupational health, sick-leave administration, rehabilitation tracking, and workplace-environment management. Privately held and based in Sweden, the company supplies its core platform, Adato, to the public sector. Roughly eighty percent of Sweden's 290 municipalities use Miljödata systems for HR processes, alongside several regions and a number of universities. The firm's customer base is concentrated in public administration, which makes its software a single point of failure for a large share of Sweden's municipal HR operations.
Why They Hold Your Data
Environmental and sustainability data firms collect client, project, compliance, and reporting records tied to environmental analysis, reporting, and data services.
Recent Developments
Miljödata is operating in the aftermath of the August 2025 ransomware attack and continuing to support municipal customers as systems are restored and incident analysis continues. The Swedish government, including the Civil Defence minister and national cybersecurity center CERT-SE, has been involved in the response. A wave of follow-on ransomware activity against Swedish municipalities through late 2025 and into 2026 has kept supply-chain risk a live policy issue. No specific ransomware group has publicly claimed responsibility for the Miljödata incident as of early 2026, and the firm has not disclosed whether the ransom was paid.
Data Points Exposed
7 verified field types
Date of Birth High
Email Address
Full Name
Gender
Government ID Critical
Phone Number
Physical address High
Breach Impact
The institutional impact on Miljödata has been substantial because of the company's central role in Swedish municipal HR. The August 2025 attack disrupted services for approximately 164 municipalities, four regions, and around 250 client organizations including universities and private firms. Stolen data was published on the dark web in mid-September 2025, and Lund University alone reported about 16,000 current and former employees in the affected dataset. The incident drew direct comment from Sweden's Civil Defence minister and accelerated national debate over public-sector supply-chain concentration risk. The reputational and regulatory consequences are likely to be long-running given the systemic nature of the disruption.
Exploitation & Downstream Threats
• Identity theft and synthetic identity construction using government-issued IDs | • Identity verification bypass using name + date of birth combination | • SIM swap attacks where phone numbers are present | • Targeted phishing campaigns using exposed email addresses | • Doxxing risk from physical address exposure
Principal Risk Advisory
What this means for a principal
A healthcare-linked breach: exposure ties a named individual to a provider relationship and, where clinical or insurance data is present, to conditions and treatment. For a high-profile principal this is targeting-grade, not merely identity-theft-grade: the combination lets an adversary locate, impersonate, or pressure the principal with little additional work.
What You Should Do
- Freeze credit at all three bureaus and monitor for new-account and tax-refund fraud.
- Treat the home address as exposed: review mail and package handling and physical-security routines, and brief household staff to verify unusual requests.
- Guard against SIM-swap and vishing: add a carrier port-out PIN and verify any 'support' calls independently.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping and footprint neutralization: cross-reference against broker-available data and suppress still-removable elements, prioritizing address and phone, since this record re-seeds broker networks.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
Protect Yourself
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