INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Yonsei University Hit by Cyberattack Months After Sogang Breach

| 2026-10-22 07:29 HIGH LOW DATA BREACH
JSON
Executive Summary
AI-generated
A cyberattack on Yonsei University in South Korea compromised the personal information of approximately 10,000 students and graduates after unauthorized access to its online portal. The breach occurred months after Sogang University disclosed a far larger leak, affecting around 2.8 million people between 2022 and July this year. The attack is believed to have started with two hacking attempts in less than a day, with the university's system being detected at 7:41 p.m. on Tuesday and a second attempt made from a different IP address the following morning. Yonsei University has reported the incident to the Personal Information Protection Commission within 72 hours of becoming aware of it and is planning a comprehensive security review of its systems, along with stronger monitoring and security measures.
Technical Mitigations AI-generated
• Reset credentials and API keys that may have been exposed, and review access logs for the affected accounts or integrations.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
Target & Sectors
Global Scope educationeducation
Incident Timeline
‎between 2022 and July this year
The Ministry of Education reported that personal data breaches at universities affected approximately 2.8 million people between 2022 and July this year, including Yonsei University's breach months after Sogang University's incident.
organisation the Ministry of Education
According to data the Ministry of Education submitted to People Power Party Rep. Kim Meen-geon, personal data breaches at universities affected 2.8 million people between 2022 and July this year.
organisation People Power Party
According to data the Ministry of Education submitted to People Power Party Rep. Kim Meen-geon, personal data breaches at universities affected 2.8 million people between 2022 and July this year.
general_metric 2.8 people
According to data the Ministry of Education submitted to People Power Party Rep. Kim Meen-geon, personal data breaches at universities affected 2.8 million people between 2022 and July this year.
‎2026/10/22
Threat actors gained unauthorized external access to Yonsei University's online portal, compromising the personal information of approximately 10,000 students and graduates.
organisation The Personal Information Protection Act
The Personal Information Protection Act requires organizations to report a personal data breach within 72 hours of becoming aware of it and to notify affected individuals.
organisation Yonsei University
Yonsei University Cyberattack Hits 10,000 Students, Months
organisation Sogang University
The breach comes months after Sogang University disclosed a far larger leak.
organisation the Yonsei Portal Service
“The personal information of some university members was confirmed to have been leaked following unauthorized external access to the Yonsei Portal Service,” the office stated.
organisation the Yonsei University Cyberattack Exposed
What the Yonsei University Cyberattack Exposed   The compromised data included student identification numbers, mobile phone numbers, and email addresses, along with system management details such as login identification keys and the number of failed password attempts on affected accounts.
organisation Yonsei University’s
From 1 p.m. Thursday, affected individuals could check on Yonsei University’s official website which details were compromised.
organisation IP
“An attack on the university’s system was detected at the time, and we immediately blocked the IP
organisation the Personal Information Protection Commission
Yonsei reported the incident to the Personal Information Protection Commission (PIPC) on Wednesday afternoon.
organisation PIPC
Yonsei reported the incident to the Personal Information Protection Commission (PIPC) on Wednesday afternoon.
organisation Sogang University Incidents   Experts
Calls for Support After Yonsei and Sogang University Incidents   Experts have called for more cybersecurity personnel and greater funding as hacking attacks grow increasingly sophisticated, including through the use of AI.
organisation Korea University’s School of Cybersecurity
“Just as the government develops information security measures for small- and medium-sized businesses, it should establish support measures to strengthen cybersecurity at universities,” said Kim Seung-joo, a professor at Korea University’s School of Cybersecurity.
Intelligence Sources
The Cyber Express 2026-10-22