Key points
- Roughly ten thousand students and graduates had personal information accessed.
- Data included student IDs, mobile numbers, emails and login keys.
- Resident registration numbers were not part of the compromised dataset.
Yonsei University confirmed that unauthorized external actors accessed its online portal, exposing the personal information of approximately ten thousand students and graduates. The Office of Information and Communications issued a formal notice to affected individuals on Thursday regarding the security incident.
According to The Cyber Express, the compromised data set included student identification numbers, mobile phone numbers and email addresses. System management details were also exposed, specifically login identification keys and records of failed password attempts for the affected accounts.
Timeline of the breach
The intrusion began at around seven forty-one p.m. on Tuesday, according to reports by The Cyber Express. The university’s systems were targeted in what appeared to be rapid succession, with two distinct hacking attempts occurring within less than a day of each other before the full extent was confirmed.
Who is affected
The breach impacts a significant portion of the university community, specifically current students and alumni. Affected individuals received direct notification from the university. From one p.m. on Thursday, those concerned could visit Yonsei University’s official website to verify which specific details had been exposed in the incident.
Our take on the response
The university moved quickly to inform victims and provide a self-service verification tool. By excluding resident registration numbers from the leak, the immediate risk of identity theft is reduced, though the exposure of login keys and failed attempt logs remains a serious concern for account security.
What affected people can do
Individuals should monitor their accounts for unusual activity, such as logins from unfamiliar locations or unexpected password reset emails. It is advisable to change passwords for university-related services and any other platforms using similar credentials. Check spam folders for suspicious messages claiming to be from the university or support teams. Do not click links in unsolicited emails. Enable multi-factor authentication wherever possible to add an extra layer of security to your accounts.
What to do and how to stay safe: Yonsei University
- Check your email inbox and spam folder for any official notifications regarding data breaches or security alerts from institutions you interact with.
- Review your login activity logs for any suspicious sessions or failed attempts that you did not initiate.
- Update your passwords for critical accounts, ensuring they are unique and not reused across different services.
- Monitor your financial statements and credit reports for any signs of unauthorized activity or new accounts opened in your name.
General security guidance from the Breach Observer newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What specific personal data was exposed in the Yonsei University breach?
The breach exposed student identification numbers, mobile phone numbers, email addresses, login identification keys and records of failed password attempts.
Were resident registration numbers compromised in this incident?
No, the university confirmed that resident registration numbers were not part of the data exposed during the unauthorized access.
When did the cyberattack on Yonsei University begin?
The attack reportedly began at around seven forty-one p.m. on Tuesday, with two attempts occurring within less than a day.