June 16, 2026
We are writing to inform you that, due to a system configuration issue, certain user data registered in our systems, including users’ names, email addresses, registered user types, and access dates and times, was unintentionally made accessible to other users registered within those systems. We sincerely apologize for any inconvenience and concern this may have caused.
We will ensure the proper management of user data and take steps to prevent recurrence.
An issue was identified where user data registered in the relevant systems was unintentionally made accessible to other users registered in those systems. These systems are used when inviting external users to use applications, participate in online meetings, and share files.
Please note that the user data was not accessible to the general public over the internet and at this stage, we have not identified any misuse of the user data or other secondary harm resulting from the issue.
The user data that was accessible is as follows:
• Affected users: Users registered in the relevant systems
• Types of data: Name, email address, user type (displayed as “Guest” or “User” for most users), access date and time (only for users registered in one specific system)
• Number of affected registered users: 139,302
• Time frame: The user data may have been accessible since around 2021.
• Date of identification: April 23, 2026
• Upon identification of the issue, we promptly changed the relevant settings to prevent registered users from viewing other users’ data.
• In accordance with the Act on the Protection of Personal Information of Japan, we have taken all required measures, including reporting to the Personal Information Protection Commission of Japan.
Access to other users’ data within the relevant systems has already been disabled. Going forward, we will establish procedures to ensure that user lists are hidden by default when inviting and registering external users in the systems. We will also further reinforce internal awareness regarding the importance of personal information and ensure its proper handling.
6. Contact for Inquiries
Komatsu Ltd.
E-mail address: JP00MB-privacy@global.komatsu
No : 0030（3443）
Corporate Communications Department
Sustainability Promotion Division
Komatsu Ltd.
tel: +81-(0)3-6849-9703
mail: JP00MB_cc_department@global.komatsu
*The information may be subject to change without notice.
