[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"news:sec-kyuden-backup-media-missing-2026-06-09":3},{"meta":4,"markdown":62},{"type":5,"articleId":6,"slug":7,"title":8,"titleEn":9,"category":10,"summary":11,"publishedAt":12,"image":13,"tags":14,"vocabulary":17,"source":60},"news","news-sec-kyuden-backup-media-missing-2026-06-09","sec-kyuden-backup-media-missing-2026-06-09","九州電力送配電、最大1090万口分を含むバックアップ媒体の所在不明を公表","Kyushu Electric T&D Discloses Missing Backup Media Tied to Up to 10.9 Million Accounts","tech-networking","Kyushu Electric Power Transmission and Distribution said on June 8, 2026 that external backup media holding customer data had gone missing from storage, creating possible exposure for up to 10.9 million accounts. The company said the temporary use of removable media was tied to pressure on backup-system capacity, and it added that no confirmed data leak had been found as of the announcement. For engineers, the case is a concrete reminder that backup operations can become a security risk when physical media controls lag behind system growth.\n","2026-06-09T00:00:00Z","https:\u002F\u002Fimages.yamiyomi.com\u002Fnews\u002Fsec-kyuden-backup-media-missing-2026-06-09.png",[15,16],"japan","cybersecurity",[18,23,27,31,36,40,44,48,52,56],{"word":19,"reading":20,"meaning":21,"level":22},"所在不明","しょざいふめい","missing whereabouts","N1",{"word":24,"reading":25,"meaning":26,"level":22},"外部記憶媒体","がいぶきおくばいたい","external storage media",{"word":28,"reading":29,"meaning":30,"level":22},"漏えい","ろうえい","leakage",{"word":32,"reading":33,"meaning":34,"level":35},"容量","ようりょう","capacity","N3",{"word":37,"reading":37,"meaning":38,"level":39},"バックアップ","backup","N4",{"word":41,"reading":42,"meaning":43,"level":22},"監督官庁","かんとくかんちょう","supervisory authority",{"word":45,"reading":46,"meaning":47,"level":22},"再発防止策","さいはつぼうしさく","recurrence prevention measures",{"word":49,"reading":50,"meaning":51,"level":22},"入退室","にゅうたいしつ","entry and exit access",{"word":53,"reading":54,"meaning":55,"level":35},"調査","ちょうさ","investigation",{"word":57,"reading":58,"meaning":59,"level":22},"供給場所","きょうきゅうばしょ","supply location",{"url":61},"https:\u002F\u002Fwww.kyuden.co.jp\u002Ftd\u002Fpress\u002F2026\u002F260608.html","\n::heading\n[九州電力送配電]{きゅうしゅうでんりょくそうはいでん:Kyushu Electric Power Transmission and Distribution:N2}、[最大]{さいだい:up to:N3}1090[万口分]{まんこうぶん:ten point nine million accounts:N4}を[含む]{ふくむ:include:N2}バックアップ[媒体]{ばいたい:media:N1}の[所在不明]{しょざいふめい:missing whereabouts:N3}を[公表]{こうひょう:disclose:N3}\n\n#en\nKyushu Electric T&D Discloses Missing Backup Media Tied to Up to 10.9 Million Accounts\n::\n\n::para\n[九州電力送配電]{きゅうしゅうでんりょくそうはいでん:Kyushu Electric Power Transmission and Distribution:N2}は[2026年6月8日]{にせんにじゅうろくねんろくがつようか:June 8, 2026:N5}、[一部]{いちぶ:part:N3}システムのデータを[保存]{ほぞん:store:N1}した[外部記憶媒体]{がいぶきおくばいたい:external storage media:N1}が[保管場所]{ほかんばしょ:storage location:N1}から[所在不明]{しょざいふめい:missing:N3}になったと[発表]{はっぴょう:announce:N3}した。[顧客情報]{こきゃくじょうほう:customer information:N1}が[社外]{しゃがい:outside the company:N4}へ[漏えい]{ろうえい:leak:N1}するおそれがあるとされる。\n\n#en\nKyushu Electric Power Transmission and Distribution said on June 8, 2026 that external storage media holding data from part of its systems had gone missing from storage. The company said the incident could create possible exposure of customer information outside the company.\n::\n\n::para\n[同社]{どうしゃ:the company:N4}によると、[現時点]{げんじてん:at the current stage:N3}では[流出]{りゅうしゅつ:outflow:N3}の[事実]{じじつ:fact:N3}は[確認]{かくにん:confirmed:N3}されていない。ただし、[無断持ち出し]{むだんもちだし:unauthorized removal:N3}の[可能性]{かのうせい:possibility:N3}も[含めて]{ふくめて:including:N2}[調査]{ちょうさ:investigation:N2}していると[説明]{せつめい:explain:N3}している。\n\n#en\nThe company said no confirmed data outflow had been found at the time of the announcement. It also said it was investigating, including the possibility of unauthorized removal.\n::\n\n::heading\n[何]{なに:what:N5}が[起きた]{おきた:happened:N4}のか\n\n#en\nWhat Happened\n::\n\n::para\n[公表文]{こうひょうぶん:public statement:N3}によると、[対象]{たいしょう:target:N2}システムではサーバのデータ[容量]{ようりょう:capacity:N2}を[確保]{かくほ:secure:N1}するため、[定期的]{ていきてき:regular:N3}なバックアップを[実施]{じっし:carry out:N1}していた。[同社]{どうしゃ:the company:N4}は、そのバックアップシステムの[容量]{ようりょう:capacity:N2}が[逼迫]{ひっぱく:tighten:N1}したため、[一時的]{いちじてき:temporary:N4}に[外部記憶媒体]{がいぶきおくばいたい:external storage media:N1}を[使った]{つかった:used:N4}バックアップを[行っていた]{おこなっていた:had been performing:N5}としている。\n\n#en\nAccording to the public statement, the affected system was being backed up regularly to secure server data capacity. The company said pressure on backup-system capacity led it to use external storage media temporarily for those backups.\n::\n\n::para\n[保管場所]{ほかんばしょ:storage location:N1}はサーバ[室]{しつ:room:N4}のキャビネットだったが、その[媒体]{ばいたい:media:N1}は[見つかっていない]{みつかっていない:has not been found:N5}。[入退室]{にゅうたいしつ:entry and exit access:N3}は[特定]{とくてい:specific:N3}の[関係者]{かんけいしゃ:authorized personnel:N3}に[限られていた]{かぎられていた:had been limited:N3}とされるが、[所在確認]{しょざいかくにん:location confirmation:N3}はまだ[続いている]{つづいている:is continuing:N3}。\n\n#en\nThe media had been stored in a cabinet inside a server room, but it has not yet been found. The company said room access was limited to specific authorized personnel, while the search for the media continues.\n::\n\n::callout\nバックアップは[障害対応]{しょうがいたいおう:incident response:N1}のための[保険]{ほけん:insurance:N1}だが、[物理媒体]{ぶつりばいたい:physical media:N1}を[増やす]{ふやす:add:N3}と、[管理]{かんり:control:N2}の[弱い]{よわい:weak:N2} [地点]{ちてん:point:N3}が[新たに]{あらたに:newly:N4}[生まれる]{うまれる:emerge:N5}ことがある。この[事案]{じあん:incident:N1}は、その[運用面]{うんようめん:operational side:N3}の[穴]{あな:gap:N1}を[示した]{しめした:showed:N3}ように[見える]{みえる:appears:N5}。\n\n#en\nBackups are insurance for incident response, but adding physical media can create new weak points in control. This case appears to show that kind of operational gap.\n::\n\n::heading\n[どの情報]{どのじょうほう:which information:N3}が[含まれていた]{ふくまれていた:was included:N2}のか\n\n#en\nWhat Information Was Included\n::\n\n::para\n[保存]{ほぞん:stored:N1}されていたのは、[需要者名]{じゅようしゃめい:customer names:N1}、[供給場所住所]{きょうきゅうばしょじゅうしょ:supply location addresses:N3}、[使用電力量]{しようでんりょくりょう:electricity usage data:N2}、[電話番号]{でんわばんごう:telephone numbers:N3}、[小売電気事業者名]{こうりでんきじぎょうしゃめい:retail electricity company names:N4}などだという。[銀行口座]{ぎんこうこうざ:bank account:N3}やクレジットカードの[情報]{じょうほう:information:N3}は[含まれていない]{ふくまれていない:not included:N2}。\n\n#en\nThe stored data included customer names, supply-location addresses, electricity-usage data, telephone numbers, and the names of retail electricity providers. The company said bank-account and credit-card information was not included.\n::\n\n::para\n[対象]{たいしょう:affected scope:N2}は[最大]{さいだい:up to:N3}1090[万口分]{まんこうぶん:ten point nine million accounts:N4}とされる。[件数]{けんすう:number of cases:N3}の[大きさ]{おおきさ:scale:N5}から、[個人情報保護]{こじんじょうほうほご:personal information protection:N1}だけでなく、[基盤事業者]{きばんじぎょうしゃ:infrastructure operator:N1}のデータ[管理]{かんり:management:N2} [体制]{たいせい:framework:N3}そのものが[問われる]{とわれる:is being questioned:N4} [事案]{じあん:incident:N1}だと[見られる]{みられる:is seen:N5}。\n\n#en\nThe affected scope was described as up to 10.9 million accounts. Given that scale, the incident is likely to raise questions not only about personal-data protection but also about the data-control framework of an infrastructure operator.\n::\n\n::heading\n[次]{つぎ:next:N3}に[何]{なに:what:N5}が[焦点]{しょうてん:focus:N1}になるか\n\n#en\nWhat Comes Next\n::\n\n::para\n[同社]{どうしゃ:the company:N4}は[個人情報保護委員会]{こじんじょうほうほごいいんかい:Personal Information Protection Commission:N1}と[監督官庁]{かんとくかんちょう:supervisory authority:N1}へ[報告済み]{ほうこくずみ:already reported:N3}だとした。さらに[同日]{どうじつ:the same day:N4}、[経済産業省]{けいざいさんぎょうしょう:Ministry of Economy, Trade and Industry:N2}から[事実関係]{じじつかんけい:factual background:N3}と[発生原因]{はっせいげんいん:cause of occurrence:N3}、[実効的]{じっこうてき:effective:N2}な[再発防止策]{さいはつぼうしさく:recurrence prevention measures:N1}を[求める]{もとめる:seek:N3} [報告徴収]{ほうこくちょうしゅう:formal demand for a report:N1}を[受けた]{うけた:received:N3}と[公表]{こうひょう:disclose:N3}している。\n\n#en\nThe company said it had already reported the case to the Personal Information Protection Commission and the relevant supervisory authority. It also disclosed that it received a formal demand for a report from Japan's Ministry of Economy, Trade and Industry on the same day, covering facts, causes, and effective recurrence-prevention measures.\n::\n\n::para\n[今後]{こんご:going forward:N5}は、[媒体]{ばいたい:media:N1}が[見つかる]{みつかる:is found:N5}かどうかに[加えて]{くわえて:in addition:N3}、[一時的]{いちじてき:temporary:N4}なバックアップ[手段]{しゅだん:method:N3}が、なぜ[大規模]{だいきぼ:large-scale:N1}な[顧客情報]{こきゃくじょうほう:customer data:N1}を[扱う]{あつかう:handle:N1} [環境]{かんきょう:environment:N1}で[許容]{きょよう:tolerated:N3}されていたのかが[重要]{じゅうよう:important:N3}な[論点]{ろんてん:point at issue:N3}になりそうだ。\n\n#en\nGoing forward, the key question is not only whether the media is found, but why a temporary backup method was tolerated in an environment handling customer data at such large scale.\n::\n\n::para\n[読者]{どくしゃ:readers:N4}がインフラや[社内基盤]{しゃないきばん:internal platform:N1}を[担当]{たんとう:be responsible for:N2}しているなら、この[事案]{じあん:incident:N1}は[容量不足]{ようりょうぶそく:capacity shortage:N2}への[場当たり的]{ばあたりてき:ad hoc:N3}な[対応]{たいおう:response:N1}が、[物理]{ぶつり:physical:N4}セキュリティと[監査可能性]{かんさかのうせい:auditability:N1}の[両方]{りょうほう:both:N3}を[崩す]{くずす:undermine:N1}ことがあると[示す]{しめす:indicate:N3} [実例]{じつれい:concrete example:N3}として[読める]{よめる:can be read:N5}。\n\n#en\nFor readers responsible for infrastructure or internal platforms, the incident can be read as a concrete example of how an ad hoc response to capacity shortages can undermine both physical security and auditability.\n::\n"]