Yahoo!ニュース, العربية and Межа reported a data breach at GMO Internet Group (Japan) on 26 October 2026, and it has been confirmed. Exposed: Passwords and logins, Phone numbers, Dates of birth, Names, Addresses and Account information.
Look for GMO Internet Group’s own notice or letter: it should say what of yours was involved. Keep it.
Change your GMO Internet Group password, and the same password anywhere else you use it. Turn on two-step sign-in.
Expect scams that use your details: calls, texts or emails pretending to be GMO Internet Group, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.