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JAENES
SPossible leakOctober 1, 2026 announced

チケットプラス（チケプラ）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 28, 2026
Announced on
October 1, 2026
Severity
SCompromise of deep personal data or usable credentials.
Scale
107 people
Main impact
An issue occurred on チケプラ where information of users other than the account holder was displayed; the company reported that up to 107 users’ information may have been displayed and up to 322 users may have been shown others’ information.
Information involved
Email addressUser / member IDCard & payment dataPhone numberHome addressFull name
Cause / key point
They state that changing the web page cache settings as a countermeasure against concentrated access caused a condition where, if multiple users accessed the same target page at the same time, another user's information could be displayed.
Industry
Services & other
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Email addressUser / member IDCard & payment dataPhone numberHome addressFull nameHow severity is assessed →

Is this incident worth paying attention to?

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: Under investigation / not stated(Cause not disclosed)

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