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Yonsei University said Thursday that personal information of about 10,000 students and graduates was leaked in a hacking of its portal service, according to Yonhap and the Korea Times. The university's information and communications office confirmed the breach, which affected the portal used by current students and alumni. Korean media are reporting the incident as a significant security failure at one of the country's top universities, with the leaked data potentially including names, contact details, and academic records. The university has not yet disclosed the full scope of the leaked information or how the hackers gained access, but it has pledged to notify affected individuals and cooperate with authorities.