nice-mail-2026 · Disclosed 2026-08-06
ナイス: unauthorized access and impact
An inquiry mailbox was accessed; the August 21 update confirms spam sent from it. About 2,400 contact records may have leaked.
Outcome: Confirmed breach
Entry path and evidence
Timeline
Disclosure date established by the reviewed notice. [s1]
Reported response
- Reported fact
Mailbox and administrative passwords were changed and sending disabled.
[s1]§§1-4 / 8月21日追記
Evidence relevant to prevention
Insufficient evidence
Undisclosed entry or patch timing prevents an avoidability assessment. Inspect privileges, retrieval logs, retention and deployed configuration using the linked rules.
Editorial assessment; not a determination of liability. [s1]
Unknowns and AI involvement
The reviewed disclosures do not establish attacker use of AI.
The initial entry route and actual disclosure scope are undisclosed. Unauthorized mail transmission was confirmed.
Sources
[s1] ナイス · Primary source
ナイス：事故に関する公表資料 ↗Reviewed 2026-10-09