G-YET confirms administrative ID leak in October Blastmail incident
On 13 November, G-YET announced the final findings of its investigation into the unauthorised access to Blastmail disclosed in October 2026. The investigation confirmed that administrative identifiers that cannot identify individuals, including reader IDs and distribution IDs associated with the Mac House email newsletter, had been exfiltrated. Names, email addresses, dates of birth, gender and regional information were not exfiltrated, and the number of leaked records was not disclosed.
Key facts
- Affected organisation
- G-YET
- Incident type
- Data breach
- Occurred / detected
- 2026-10
- Scale of damage
- Reader IDs and distribution IDs that cannot identify individuals were confirmed leaked. Names, email addresses, dates of birth, gender and regional information were not exfiltrated. The number of leaked records was not disclosed.
- Cause / method
- Unauthorised access to Blastmail
- Location
- Japan
If your data was exposed
- Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organisation’s official website or app.
Timeline
- G-YET released the findings of its investigation into a possible information leak resulting from unauthorised access to Blastmail.
1 related reports
The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organisation’s official statements for accurate details.