GMO INTERNET GROUP.
DATA BREACH

GMO Internet Group data breach: the details

• Type: Other attack
• Sector: Technology
• Where: Tokyo, Japan
• Reported as behind it: Unnamed hacker group, per report
• Reports, last 14 days: 94
• Latest report: 10:35 UTC, 30 October 2026

More cyber attacks in Japan

Latest GMO Internet Group news

• GMO bounty scheme passes 400 tip-offs in three days, used to identify cyber attack perpetratorsYahoo!ニュース · Other attack · Tokyo, Japan · 30 Oct 2026, 10:35 UTC
• GMO cyberattack raises questions over management crisis response; possible shareholder derivative suit日経ビジネス電子版 · Other attack · Tokyo, Japan · 30 Oct 2026, 08:33 UTC
• GMO cyberattack: leaked customer data shared in mosaic posts sparks backlash; lawyer asked about possible compensation claimsYahoo!ニュース · Data breach · Tokyo, Japan · 30 Oct 2026, 08:30 UTC
• GMO cyber attack raises questions over management crisis response; possible shareholder derivative suit日経ビジネス電子版 · Other attack · Tokyo, Japan · 30 Oct 2026, 08:00 UTC
• GMO says it is tracking the hackers and blocking the leak of stolen dataNHKニュース · Data breach · Tokyo, Japan · 30 Oct 2026, 04:32 UTC
• What happened in the GMO data leak? Kobe University professor points to a blind spotITmedia · Data breach · Tokyo, Japan · 29 Oct 2026, 22:00 UTC
• Japan Govt Seeks Website Block after GMO CyberattackNippon.com · Other attack · Japan · 29 Oct 2026, 06:27 UTC
• Selling of GMO bonds continues amid credit fears after cyber attack, with extra interest rate spreads jumpingTBS NEWS DIG · Other attack · Tokyo, Japan · 29 Oct 2026, 06:14 UTC
• Experts say attackers may be amateurs using AI, citing ransom reductions and overly polite extortion in GMO cyberattackktv.jp · Ransomware · Tokyo, Japan · 29 Oct 2026, 05:30 UTC
• GMO confirms takedown of attacker site that published personal data stolen in cyber attack日経クロステック Active · Data breach · Tokyo, Japan · 29 Oct 2026, 03:40 UTC
• GMO bonds face credit concerns as cyber attack sends spreads sharply higherBloomberg.com · Other attack · Tokyo, Japan · 29 Oct 2026, 02:43 UTC
• Cyberattack on GMO Internet Group affects serversCuestión Entrerriana · Service disruption · Japan · 29 Oct 2026, 01:55 UTC

Every report, last 14 days

• GMO cyber attack: what is the investigation focus, and will the 150 million yen bounty help identify the culprits?Yahoo!ニュース · Other attack · Tokyo, Japan · 29 Oct 2026, 00:35 UTC
• GMO cyber attack: experts note reduced ransom and unusually polite threats, suggesting an amateur attacker using AIYahoo!ニュース · Ransomware · Tokyo, Japan · 28 Oct 2026, 23:01 UTC
• GMO extortion site effectively shut down; bounty for information totals about 150 million yen, with 113 tips in six hours日テレNEWS NNN · Data breach · Tokyo, Japan · 28 Oct 2026, 15:50 UTC
• GMO receives 113 reports through its cyber attack information hotlineYahoo!ニュース · Other attack · Tokyo, Japan · 28 Oct 2026, 14:48 UTC
• Japanese internet provider GMO urges customers to unplug computers after cyber attackAOL.com · Other attack · Tokyo, Japan · 28 Oct 2026, 14:36 UTC
• Japanese internet provider GMO urges customers to unplug computers after cyber attackDaily Express US · Other attack · Japan · 28 Oct 2026, 14:36 UTC
• Japanese internet giant GMO tells customers to shut down and disconnect PCs from the internet following data breach and ransomware threatDataBreaches.net · Data breach · Tokyo, Japan · 28 Oct 2026, 12:31 UTC
• Japanese internet giant GMO tells customers to shut down and disconnect PCs from the internet following data breach and ransomware threatTechRadar · Data breach · Tokyo, Japan · 28 Oct 2026, 12:15 UTC
• Cyber attack on GMO; Chief Cabinet Secretary urges restraint in spreading damage information日本経済新聞 · Other attack · Tokyo, Japan · 28 Oct 2026, 11:26 UTC
• GMO cyber attack: about 1.2 million yen lost, face photos leaked, passwords reissued without consent; Osaka University professor warns of impersonation loginsYahoo!ニュース · Data breach · Tokyo, Japan · 28 Oct 2026, 11:06 UTC
• Japan's GMO Internet Group faces daily leak threats after refusing ransom; purported customer data appears onlineInternational Business Times UK · Ransomware · Tokyo, Japan · 28 Oct 2026, 08:45 UTC
• Japan's GMO offers $1 million bounty to catch hackers behind FX trading cloud breachThe Hacker News · Other attack · Japan · 28 Oct 2026, 07:13 UTC
• Japan's GMO Offers $1 Million Bounty to Catch Hackers Behind FX Trading Cloud BreachThe Hacker News · Data breach · Tokyo, Japan · 28 Oct 2026, 07:13 UTC
• GMO extorted for nearly 1.3 trillion VND after cyberattackVietnam.vn · Ransomware · Vietnam · 28 Oct 2026, 07:00 UTC
• Japan's GMO says hacker site with allegedly leaked customer data taken down after cyberattackThe Straits Times · Data breach · Japan · 28 Oct 2026, 05:11 UTC
• GMO sets up dedicated tip line seeking information on people involved in cyber attack; confirms attacker's site domain suspendedYahoo!ニュース · Other attack · Tokyo, Japan · 28 Oct 2026, 03:36 UTC
• Tokyo police investigate cyber attack on GMO on suspicion of unauthorised computer access; also questioning victims whose personal data was publishedFNNプライムオンライン · Data breach · Tokyo, Japan · 28 Oct 2026, 02:58 UTC
• Person whose data was exposed in GMO cyber attack baffled by CEO interview: 'I never used the service'; CEO Kumagai offers $1 million reward for attackerYahoo!ニュース · Data breach · Tokyo, Japan · 28 Oct 2026, 02:24 UTC
• Customer and company data published after cyber attack on GMO; Tokyo police investigating, including suspected unauthorised access law violation日テレNEWS NNN · Data breach · Tokyo, Japan · 28 Oct 2026, 02:06 UTC
• Tokyo Police Investigate Cyberattack on GMONippon.com · Other attack · Tokyo, Japan · 28 Oct 2026, 00:16 UTC
• GMO cyber attack: hacker group publishes one individual's personal data after negotiations fail, announces new statement and daily noon releasesYahoo!ニュース · Data breach · Shibuya, Japan · 27 Oct 2026, 22:44 UTC
• 'Theatrical' cyber attack on GMO: experts warn that spreading the stolen data would fuel extortion and help criminalsYahoo!ニュース · Data breach · Tokyo, Japan · 27 Oct 2026, 22:22 UTC
• Explainer: 'theatrical' cyber attack on GMO; experts say spreading the stolen data helps extortion and aids criminalsYahoo!ニュース · Data breach · Tokyo, Japan · 27 Oct 2026, 22:22 UTC
• Cyber attack: customer and company data confirmed published; GMO says it will never comply with extortion demands, expert warns customers could be targeted next日テレNEWS NNN · Data breach · Tokyo, Japan · 27 Oct 2026, 21:55 UTC
• About 150 million yen bounty offered to identify culprit of GMO cyber attack; hacker publishes personal data of first personTBS NEWS DIG · Data breach · Tokyo, Japan · 27 Oct 2026, 16:21 UTC
• Company refuses to ever meet attacker's demands in 'theatrical' cyber attack on GMO, with a 150 million yen bounty offered日テレNEWS NNN · Other attack · Tokyo, Japan · 27 Oct 2026, 14:31 UTC
• Personal data leak worries users of investment platform of Japanese company GMONHKニュース · Data breach · Japan · 27 Oct 2026, 13:45 UTC
• Cyber attack on GMO: claimed stolen information published; leaks also reported at travel sites and banks日テレNEWS NNN · Data breach · Tokyo, Japan · 27 Oct 2026, 11:02 UTC
• GMO offers $1 million bounty for identifying culprit of cyber attackCNET Japan · Other attack · Tokyo, Japan · 27 Oct 2026, 10:49 UTC
• Customer information published after cyber attack on GMO; Chief Cabinet Secretary Kihara says it is 'absolutely unforgivable' and urges people not to spread it日テレNEWS NNN · Data breach · Japan · 27 Oct 2026, 08:12 UTC
• Hackers Publish Alleged GMO Customer Data as Broker FXTF Shuts Out Overseas LoginsFinance Magnates · Data breach · Japan · 27 Oct 2026, 07:36 UTC
• Hacker discloses GMO customer info after not getting ransomJapan Today · Data breach · Tokyo, Japan · 27 Oct 2026, 07:34 UTC
• Information about customers and the company published after cyber attack on GMO, confirmed日テレNEWS NNN · Data breach · Tokyo, Japan · 27 Oct 2026, 07:02 UTC
• GMO bonds keep selling off over credit fears after cyber attack; spreads surgeTBS NEWS DIG · Other attack · Tokyo, Japan · 27 Oct 2026, 07:00 UTC
• Cyber attacks in succession: GMO hacker group publishes one person's personal data; cyber damage confirmed at five FX companies; minister asks all providers to strengthen monitoring; Rakuten Travel and JR Central among personal data leaksTBS NEWS DIG · Data breach · Japan · 27 Oct 2026, 06:30 UTC
• GMO Hit by $50 Million Ransomware Demand; Japan's Finance Minister Expresses High Concern富途牛牛 · Ransomware · Tokyo, Japan · 27 Oct 2026, 06:07 UTC
• Hacker group publishes personal data of one person after GMO cyber attack talks fail, promises daily releases at noonTBS NEWS DIG · Data breach · Tokyo, Japan · 27 Oct 2026, 04:53 UTC
• Deadline nears for ransomware attack warning; GMO urges users to power off PCsKAB 熊本朝日放送 · Ransomware · Tokyo, Japan · 27 Oct 2026, 04:11 UTC
• Ransomware attack deadline approaching; GMO urges users to power off PCsテレ朝NEWS · Ransomware · Japan · 27 Oct 2026, 03:09 UTC
• Ransomware attack deadline approaching; GMO urges users to turn off PCsQAB 琉球朝日放送 · Ransomware · Japan · 27 Oct 2026, 03:09 UTC
• Financial minister Katayama on cyber attack on GMO: customer damage reported by 5 FX firms日テレNEWS NNN · Other attack · Tokyo, Japan · 27 Oct 2026, 02:42 UTC
• GMO unauthorised access: ransomware attack threatened, customer data may be published, customers urged to switch off devicesテレ東BIZ · Ransomware · Japan · 27 Oct 2026, 02:13 UTC
• Hacker attack on GMO in Japan compromises investor accountsPortal Mie · Data breach · Japan · 26 Oct 2026, 23:00 UTC
• Cyber attacker spreads threatening content after unauthorised access to GMO朝日新聞 · Data breach · Tokyo, Japan · 26 Oct 2026, 20:00 UTC
• Possible attacker of GMO cyberattack announces release of customer data and ransomware attack for noon on the 27th日テレNEWS NNN · Data breach · Tokyo, Japan · 26 Oct 2026, 16:07 UTC
• Series of cyber attacks: about 550 million yen loss feared from fraudulent e-gift issuance, and GMO faced a ransom demandTBS NEWS DIG · Ransomware · Tokyo, Japan · 26 Oct 2026, 15:44 UTC
• Cyberattack sends GMO shares down 15%, which warns that the Internet is on the brink of collapseABC Color · Other attack · Tokyo, Japan · 26 Oct 2026, 10:55 UTC
• GMO demands 7.9 billion yen; cyber attacker's threat letter published, payment refused朝日新聞 · Data breach · Japan · 26 Oct 2026, 10:39 UTC
• Cyberattack rocks Japan: GMO to pay compensation as shares plummet nearly 14 percentAktualita.co · Other attack · Tokyo, Japan · 26 Oct 2026, 04:36 UTC
• Cyberattack and incalculable liability risks: GMO Internet Group shares plunge double digitsInvesting.com Deutsch · Other attack · Tokyo, Japan · 26 Oct 2026, 03:50 UTC
• Government cybersecurity ministerial meeting to be held this evening amid successive cyber attacks including on GMOau Webポータル · Other attack · Tokyo, Japan · 26 Oct 2026, 03:27 UTC
• GMO controversy roundup: information leak from FX automated trading server, with reports of unauthorised tradesCRYPTO TIMES · Data breach · Japan · 26 Oct 2026, 02:25 UTC
• GMO Internet Group shares plunge as company announces compensation for cyberattack losses and president speaks outInfoseek · Other attack · Tokyo, Japan · 26 Oct 2026, 01:27 UTC
• GMO representative says customers' losses will be compensated after cyber attackInfoseek · Other attack · Tokyo, Japan · 25 Oct 2026, 23:47 UTC
• GMO Internet Group shares plunge as company president pledges to compensate losses from cyber attackReuters · Other attack · Tokyo, Japan · 25 Oct 2026, 23:47 UTC
• GMO Internet Group shares plunge as company pledges compensation for cyber attack lossesニューズウィーク日本版 · Other attack · Tokyo, Japan · 25 Oct 2026, 23:47 UTC
• GMO Internet Group shares plunge as company pledges compensation for cyber attack lossesｄメニューニュース · Other attack · Tokyo, Japan · 25 Oct 2026, 23:47 UTC
• Cyber attack on GMO, with threats spreading online; 'exactly what the attackers want'Yahoo!ニュース · Other attack · Tokyo, Japan · 25 Oct 2026, 23:22 UTC
• Information leaked from GMO server, possible unauthorised operation of FX accounts; users urged to checkYahoo!ニュース · Data breach · Japan · 25 Oct 2026, 09:39 UTC
• GMO urges government for emergency cyber defences after account information leak; losses to be compensated and 5,000 yen condolence payment to all customersスポニチ Sponichi Annex · Data breach · Tokyo, Japan · 24 Oct 2026, 20:30 UTC
• Japan asks for cyber defences; GMO confirms unauthorised transactions, account information leaked, losses to be compensated琉球新報デジタル · Data breach · Tokyo, Japan · 24 Oct 2026, 20:00 UTC
• GMO asks government for urgent active cyber defence after unauthorised trades confirmed; account data leaked, losses to be compensated山陰中央新報デジタル · Data breach · Tokyo, Japan · 24 Oct 2026, 19:00 UTC
• GMO to compensate losses from fraudulent trades after cyber attack on FX VPS service, with 5,000 yen condolence paymentITmedia · Other attack · Japan · 24 Oct 2026, 08:51 UTC
• GMO Hit by Cyberattack; Customers Report Unauthorized TransactionsThe Japan News · Fraud / phishing · Japan · 24 Oct 2026, 07:47 UTC
• GMO to pay 5,000 yen condolence payment to all users after cyberattack on FX environment; realised losses from unauthorised trades to be compensatedYahoo!ニュース · Other attack · Tokyo, Japan · 24 Oct 2026, 07:10 UTC
• GMO to pay 5,000 yen condolence payment to all users after cyber attack on FX environment; realised losses from unauthorised trades to be compensatedYahoo!ニュース · Other attack · Tokyo, Japan · 24 Oct 2026, 07:10 UTC
• GMO offers 5,000 yen condolence payment to all users after cyber attack on FX environment; compensation for realised losses from unauthorised tradesオタク総研 · Other attack · Tokyo, Japan · 24 Oct 2026, 07:05 UTC
• Hacker group publishes one individual's personal data after GMO cyber attack negotiations fail, promises daily noon releasesTBS NEWS DIG · Data breach · Japan · 24 Oct 2026, 07:00 UTC
• GMO urges 'active cyber defence' and will pay 5,000 yen to all users after unauthorised access leaked customer data; refuses ransom demandTBS NEWS DIG · Data breach · Japan · 24 Oct 2026, 05:28 UTC
• GMO to pay ¥5,000 condolence payment to all customers over FX information leakSmartNews · Data breach · Tokyo, Japan · 24 Oct 2026, 05:13 UTC
• GMO confirms information leak福島民報デジタル · Data breach · Japan · 24 Oct 2026, 04:46 UTC
• GMO asks government for active cyber defence after unauthorised access leads to information leak朝日新聞 · Data breach · Tokyo, Japan · 24 Oct 2026, 03:56 UTC
• GMO confirms information leak and will pay condolence money to all users京都新聞デジタル · Data breach · Tokyo, Japan · 24 Oct 2026, 03:50 UTC
• Breaking: GMO confirms information leak, to give condolence payments to all users47NEWS · Data breach · Tokyo, Japan · 24 Oct 2026, 03:50 UTC
• Unauthorised access: 2.5 million yen lost in fraudulent FX trades in GMO cyber attack毎日新聞 · Fraud / phishing · Japan · 23 Oct 2026, 17:01 UTC
• Unauthorised trades on FX accounts; login information possibly leaked, GMO says時事ドットコム · Data breach · Tokyo, Japan · 23 Oct 2026, 05:56 UTC
• Information leaked from GMO servers, possible unauthorised operation of FX accounts; users urged to checkテレ朝NEWS · Data breach · Japan · 22 Oct 2026, 20:56 UTC
• GMO server information leak may have led to unauthorised operation of FX accounts; users urged to checkHOME広島ホームテレビ · Data breach · Japan · 22 Oct 2026, 20:56 UTC
• ARTEX AI used in attacks on Japanese companies, GMO confirmsPasquale Pillitteri · Other attack · Tokyo, Japan · 22 Oct 2026, 16:27 UTC
• GMO reverses 'no misuse confirmed': FX account login information may have leaked, unauthorised trades reportedYahoo!ニュース · Data breach · Tokyo, Japan · 22 Oct 2026, 09:22 UTC
• AI tool that hacked Korean banks was used in Japan, GMO saysThe Star · Other attack · Tokyo, Japan · 20 Oct 2026, 07:00 UTC
• Cyberattacks with traces of AI tool use found one after another; GMO-affiliated firms among those investigatingBloomberg.com · Other attack · Tokyo, Japan · 19 Oct 2026, 07:00 UTC