LINE Yahoo Japan announces information leaks of about 400,000 cases|Alerts against future phishing emails
On November 27, 2023, LINE Yahoo Japan announced that user information, business partner information, and employee information were leaked due to unauthorized access by a third party.
As for the flow of discovery, suspicious access was detected on October 19, and as a result of analysis, it was found to be unauthorized access on October 27. In addition, unauthorized access began on the 9th. It is reported that 302,569 cases of user information (129,894 cases of Japan users), 86,105 cases of business partner information, and 51,353 cases of employee information were confirmed to be leaked.
It is explained that the unauthorized access was caused by a computer virus infection on the PC of an employee of a contractor of LINE Yahoo Japan and Naver Cloud of Korea. LINE Yahoo! JAPAN plans to contact users and business partners who may be at risk of secondary damage due to information leakage. In the future, attention is being paid to scams and phishing emails pretending to be LINE Yahoo! JAPAN.
LINE Yahoo Japan was created as a new company on October 1 through the merger of Yahoo Japan and LINE.
Back in 2013, Yahoo Japan leaked up to 22 million identity information and about 1.5 million passwords through unauthorized access ( Reference: ID leakage due to unauthorized access. What are the lessons learned from the incident in the face of Yahoo's biggest crisis? ）。
LINE has received administrative guidance from the Ministry of Internal Affairs and Communications after it was found that user information of LINE GIFT was leaked to the recipient of the gift between 2015 ~ 2023, and that the staff of an affiliated company in China had access to the personal information of the Japan in 2018 ~ 2021 ( Reference: Guidance from the Ministry of Internal Affairs and Communications to the Company and the Company's Improvement Measures ）。
