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Reported breach

3 data breach

DKDenmark

Computerworld Danmark and Computerworld reported a data breach at 3 (Denmark) on 26 October 2026. It affected 400,000 customers. Exposed: Names and Addresses.

Status
Reported breach
People affected
400,000 customers
Reported
26 October 2026

What was exposed

  • Names
  • Addresses

How it happened

How
Hacking Adgangen til mobilkundernes oplysninger er sket via en API i den danske forretning source
Way in
API Adgangen til mobilkundernes oplysninger er sket via en API i den danske forretning source

Sources

If 3 had your data

  1. Look for 3’s own notice or letter: it should say what of yours was involved. Keep it.
  2. Expect scams that use your details: calls, texts or emails pretending to be 3, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

One email to confirm first. We use your address only for this alert, and one click deletes it.

More breaches in Denmark

  1. 3 DanmarkDKDenmark · 23 October 2026 NamesAddresses 400Kcustomers
  2. University of CopenhagenDKDenmark · 22 October 2026 CPR (national ID) numbersGovernment ID numbersEmail addresses+6 545Kpeople
  3. NovoreportedDKDenmark · 21 October 2026 NamesProfessional rankingsCommercial value assessments+7 46Khealthcare professionals
  4. MagasinDKDenmark · 21 October 2026 NamesAddressesPurchase history –not reported
  5. CPR (Danish national population register)reportedDKDenmark · 15 October 2026 CPR (national ID) numbersDates of birthNames+1 8.8Mcitizens

Every breach in Denmark →

From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Found a mistake? Tell us and we correct it.