Privacy Unpacked

Confirmed breach

Yonsei University data breach

KRSouth Korea

UA.NEWS reported a data breach at Yonsei University (South Korea) on 21 October 2026, and it has been confirmed. It affected 10,000 people. Exposed: Passwords and logins, Email addresses, Phone numbers, Names, Student ID numbers and Faculty identification numbers and more.

If Yonsei University had your data

  1. Look for Yonsei University’s own notice or letter: it should say what of yours was involved. Keep it.
  2. Change your Yonsei University password, and the same password anywhere else you use it. Turn on two-step sign-in.
  3. An ID number cannot be changed, so lock it: a credit freeze or fraud alert in the US, a credit warning (kreditadvarsel) on borger.dk in Denmark, Cifas protective registration in the UK.
  4. Expect scams that use your details: calls, texts or emails pretending to be Yonsei University, 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.

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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.