An individual's pension records were shared with a user of a related website due to a mistake involving the linkage of data to their My Number personal identification number, the government said Monday.
The person whose records were shared is a former member of the mutual aid association for prefectural government personnel, according to the internal affairs ministry and the Digital Agency.
The pension records were linked to someone else's My Number due to human error and were shared on the Mynaportal portal site for My Number cardholders. The issue did not affect pension payments to the individual in question, according to the government.
My Number cardholders can view their own pension records online by logging in to the portal site.
The ministry became aware of the trouble following a report Wednesday from the Digital Agency. The issue has already been resolved.
The mutual aid association has about 330,000 members. The ministry will hear from related staffers to find details of how the linkage error happened. It plans to issue instructions for checking if there have been any similar problems.