To everyone who participated in the “New Enrollment Congratulations Event” from 1998 to 2001.

YCC Information Systems (Yamagata City) has published the results of an external investigation into a cyber attack that occurred in April.

The attack is believed to have been caused by the attacker obtaining or guessing credentials to infiltrate the internal network. Personal information of participants in the “New Enrollment Congratulations Event” hosted by Yamagata Shimbun from 1998 to 2001 may have been leaked externally, but no leakage of personal information has been confirmed at this time. The company stated that it will continue to monitor the internet and implement security measures. Currently, no leakage of personal information of participants in the “New Enrollment Congratulations Event” hosted by Yamagata Shimbun from 1998 to 2001 has been confirmed, but please be cautious of suspicious phone calls. Notices regarding this matter have been mailed to the affected individuals.

Inquiries about this matter are accepted at the Yamagata Shimbun Advertising Bureau (023-622-5274, weekdays 10:00 AM to 5:00 PM).