Confirmed

SoftBank: proxy bug caused 2,019 My SoftBank wrong-profile displays and related MMS faults

SoftBank announced on January 27 that a proxy-server software bug could briefly treat customers as someone else, causing wrong My SoftBank profiles and MMS sender/recipient mix-ups. Not a cyber-attack.

Last updated: 2026-11-09

Overview

For 13 Jan 09:47–17 Jan 02:22: (1) 2,019 My SoftBank/etc displays, (2) 2,209 sender swaps, (3) 1,906 wrong receives, (4) 2,241 other—not summed; count stores (1) 2,019. Earlier period estimated “up to 200” (text only). Possible fields: name, address, birth date, phone, contract and billing.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

  1. プロキシーサーバーの不具合による事象の発生についてソフトバンク株式会社 · 2026-11-09

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