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JAENES
BPossible leakOctober 26, 2026 announced

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）Data breach / unauthorized access incident

笹尾 祐太朗の写真Reviewed by Yutaro SasaoWritten by Leak Watch editorial team published ・ updated
Occurred on
September 30, 2026
Announced on
October 26, 2026
Severity
BIncidents centered on names and contact details.
Scale
8,109 records
Main impact
Due to unauthorized access to the external service “Studio” used to operate some group websites, it was disclosed that inquiry form information for approximately 8,109 records may have been leaked: マネーフォワード (recruitment site) 4,150, マネーフォワードホーム 713, マネーフォワードエックス 257, マネーフォワードケッサイ 2,984, and アウトルックコンサルティング 5 (inquiry form information: name, company name, email address, phone number, inquiry details, etc.). There was no impact on recruitment application information (resumes, etc.) or the core services, and as of now no confirmed leakage, third-party acquisition, or secondary damage has been identified; all forms on Studio were disabled and migrated to a different system.
Information involved
Full nameEmail addressPhone number
Cause / key point
Unauthorized third-party access to the website building and hosting service “Studio” (occurred from 2026年9月30日〜10月1日に by exploiting a vulnerability; Studio addressed it on 10月14日).About Exploitation of vulnerabilities
Industry
Finance & insurance
Listing / capital
Listed companyTSE Prime 3994(マネーフォワード)
Sources
Last updated
October 29, 2026

Stock price reaction to the disclosureマネーフォワード / 東証プライム 3994

2026.10.06 〜 2026.10.29Loading…

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Written & reviewed

笹尾 祐太朗の写真

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

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Attack method classification: Exploitation of vulnerabilities(Breaking in through holes in software and devices)

Read the Exploitation of vulnerabilities guide and national trends →

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