デジタル庁（ホームページ問い合わせフォーム、運営の一部委託先: Studio）Data breach / unauthorized access incident
- Occurred on
- September 30, 2026
- Announced on
- October 22, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 13,358 records
- Main impact
- They disclosed that personal information entered into inquiry forms may have been leaked due to unauthorized access to the external service Studio, which was used for part of homepage operations. Affected were people who inquired to デジタル庁HP between 2021年5月〜2023年3月: general opinions/requests up to 8,833 cases, vaccination certificate app–related up to 3,661 cases, recruitment–related up to 250 cases, workshop participation–related up to 462 cases, マイナちゃん costume borrowing–related up to 117 cases, and 35 Studio accounts of staff, totaling up to about 1.3万件 (many names and email addresses were optional so the actual number may be smaller); data items include names, email addresses, and inquiry contents, and in some cases phone numbers, addresses, and affiliations, and whether an actual leak occurred is unknown, with Digital Minister Furukawa requesting a report from Studio.
- Information involved
- Full nameEmail addressPhone numberHome address
- Cause / key point
- Unauthorized access to the external service Studio used for part of homepage operations (2026年9月30日〜10月1日; Studio reported this on 10月16日).
- Industry
- Government & municipal
- Listing / capital
- Government / public body
- Last updated
- October 29, 2026
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Written & reviewed
Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.
CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.
Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:
Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction
Related incidents
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Other incidents at デジタル庁
Incidents related to "フォーム"
Incidents where the damage spread through the same service or system.
- Bマネーフォワード（グループ各社の問い合わせフォーム、Webサイト運営委託先: Studio）2026.10.26 announced・Affected 8,109 records
- B中日サービス（問い合わせフォーム）2026.10.22 announced・Affected 112 records
- Bフジッコ2026.10.22 announced・Affected 15,500 records
- Aand US（Studio問い合わせフォーム）2026.10.19 announced・Affected 1,024 records
- A長崎市（長崎満喫!アウェイ遠征応援キャンペーン）2026.10.19 announced・Affected 19 people
- A志摩市民病院（問い合わせフォーム）2026.10.19 announced・Affected 8 records
Incidents related to "studio"
Incidents where the damage spread through the same service or system.
- A青森市（公民連携ポータルサイト）2026.10.19 announced・Affected 11 records
- B秋田県（あきたデジタルアカデミー）2026.10.19 announced・Affected 164 people
- B広島県府中市（道の駅びんご府中サイト）2026.10.19 announced・Affected 123 records
- B福岡コンベンションセンター（問い合わせ・予約フォーム）2026.10.19 announced・Affected 1,185 records
- B岐阜県（GIFU新事業共創チャレンジ）2026.10.19 announced・Affected 2 records
- Bメディアリンク（Studio問い合わせフォーム）2026.10.19 announced・Affected 901 records
Same attack method
- A佐川急便（お荷物問い合わせ）2026.10.01 announced・Affected 53,230,000 records
- SSソースネクスト2026.10.15 announced・Affected 22,519,960 records
- SSバーガーキング・ジャパン(公式アプリ)2026.10.15 announced・Affected 11,180,000 records
- SS焼肉きんぐ2026.10.05 announced・Affected 10,788,963 records
- SSタイムズカー(タイムズモビリティ)2026.09.25 announced・Affected 6,600,000 accounts
- Sブックオフグループ(ブックオフコーポレーション)2026.10.09 announced・Affected 6,383,279 people
Same industry
- S厚生労働省（1FEdu・テクノヒル）2026.10.22 announced・Affected 595 people
- S市立岸和田市民病院（患者書類）2026.10.16 announced・Affected 1 people
- S大崎地域広域行政事務組合消防本部（NET119・119RAIDEN）2026.10.14 announced・Affected 45 people
- S神奈川県警（使用済み運転免許証）2026.10.09 announced・Affected 30 records
- S長崎市（マイナンバーカード特急発行書類の紛失）2026.09.08 announced・Affected 4 people
- S村田製作所2026.04.27 announced・Affected 73,000 records
Attack method classification: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)
Read the Unauthorized access (method undisclosed) guide and national trends →