BPossible leakJanuary 8, 2026 announced

株式会社スマレジData breach / unauthorized access incident

Reviewed by Yutaro SasaoWritten by Leak Watch editorial teamJanuary 8, 2026 published ・ October 20, 2026 updated

Occurred on: Unconfirmed
Announced on: January 8, 2026
Severity: BIncidents centered on names and contact details.
Scale: Unknown
Main impact: In certain third-party apps integrated with スマレジ, it was found that member data held by the app providers was improperly acquired and disclosed; no leak from スマレジ itself has been confirmed.
Information involved: Not specified in the disclosure
Cause / key point: Cause under investigation.
Industry: Retail & e-commerce
Listing / capital: Listed company東証グロース 4431(スマレジ)
Sources: 【重要】一部のSNSにおける投稿について：当社におけるデータの流出は確認されておりません 2026-01-08
Last updated: October 20, 2026

Stock price reaction to the disclosureスマレジ / 東証グロース 4431

2025.12.19 〜 2026.01.29Loading…

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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: October 20, 2026

Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction