Confirmed breach

Coinone data breach

KRSouth Korea

Herald Business and Financial News reported a data breach at Coinone (South Korea) on 14 November 2026, and it has been confirmed.

People affected: Not reportedno count given yet
Reported: 14 November 2026News report and 1 more

What was exposed 8

Government ID numbers
Financial account and card details
Passwords and logins
Email addresses
Phone numbers
Dates of birth
Names
Resident registration numbers

How it happened

How: Hacking a hacker broke into the servers of an outside firm handling its customer support operations source
Through: MetaM an unauthorized party had broken into the servers of MetaM, its outsourced customer support provider source
Way in: MetaM an unauthorized party had broken into the servers of MetaM, its outsourced customer support provider source

Sources 2

News reportHerald BusinessCoinone customer data leaked after hack of outsourced call center operator14 November 2026
Confirmed by Coinone: Coinone said it confirmed Sunday morning, around 8 a.m., that an unauthorized party had broken into the servers of MetaM, its outsourced customer support provider, and accessed or extracted customer support data.
News reportFinancial NewsCoinone, personal information leaked due to hacking of customer service outsourced company (our translation from Korean)14 November 2026

News reports are read by an AI model; every fact taken from an article was checked word for word against it, and anything it could not find was dropped. · Corrections and changes

If Coinone had your data

Look for Coinone’s own notice or letter: it should say what of yours was involved. Keep it.
Change your Coinone password, and the same password anywhere else you use it. Turn on two-step sign-in.
Call your bank on the number printed on your card (never one from a message), check recent payments and ask for a new card.
An ID number cannot be changed, so lock it: a credit freeze or fraud alert in the US, a credit warning (kreditadvarsel) on borger.dk in Denmark, Cifas protective registration in the UK.
Your email address is out: expect convincing phishing. Open Coinone by typing its address yourself, never through a link in an email or text, and check the sender before you reply.
Your phone number is out: ask your mobile operator for a PIN or port-out lock, so nobody can move your number to another SIM card and take your login codes.
Expect scams that use your details: calls, texts or emails pretending to be Coinone, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

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Questions about the Coinone breach

Was Coinone hacked?

Herald Business and Financial News reported a data breach at Coinone (South Korea) on 14 November 2026, and it has been confirmed. How it happened, by the sources: hacking, through MetaM.

What data was exposed in the Coinone breach?

Government ID numbers, Financial account and card details, Passwords and logins, Email addresses, Phone numbers, Dates of birth, Names and Resident registration numbers, by the notices and reports on this page.

How do I know if I was affected?

Organisations normally tell the people whose data was involved, by letter or email, and that notice says what of yours was in it. We cannot look up individual people. If you got a notice, check that it is real, then follow the steps on this page.

Is there a Coinone data breach settlement?

No settlement open for claims is on record for Coinone as of 15 November 2026. Every open settlement is listed with its deadline.

Is a letter, email or text about the Coinone breach real or a scam?

A real notice names the breach, says what data was involved and never asks for a password, a code or a payment. Criminals often send fake notices after a breach is in the news. Do not use links or phone numbers in the message: go to Coinone’s own site, or check the letter here.

More breaches in South Korea

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From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Accuracy audit · For journalists · Found a mistake? Tell us and we correct it.