SoftBankLine authentication and messaging
2LowConfirmedAnnounced
An authentication fault showed other users' data in My SoftBank and allowed cross-account MMS and messaging use. Names, addresses, birth dates and phone numbers were shown to other users.
This incident was imported from a dataset that compiles public announcements, and we are still checking it against the sources. Counts and causes will be updated after the check. Sources are in Japanese.
- Cause
- Sent to the wrong person
- Occurred
- 2026-01-13 – 2026-01-17
- Sector
- IT, cloud & telecom
- Operational impact
- None
Data involved
| Data | Status | Count | Group | Evidence |
|---|---|---|---|---|
| Name | Access confirmed | Not disclosed | — | Source(opens in a new tab) |
| Postal address | Access confirmed | Not disclosed | — | Source(opens in a new tab) |
| Date of birth | Access confirmed | Not disclosed | — | Source(opens in a new tab) |
| Phone number | Access confirmed | Not disclosed | — | Source(opens in a new tab) |
| Email address | No leak found | Not disclosed | — | Source(opens in a new tab) |
Counts are the figures the organization announced. Because the same person may be counted more than once, we do not add the rows together.
What users should do
- Watch for emails and texts pretending to be the company
General steps based on the type of data involved. Check the organization’s notice or help line to see whether you are affected.