Sega Confirms 2.19 Million Email Addresses Leaked Through Newsletter Contractor ARARA
Sega said unauthorized access to ARARA Message, the email newsletter service run by contractor ARARA, leaked 2,196,044 email addresses, with 92,273 of those records also including what Sega calls information accompanying distribution.
1 source 3h ago
Reporting from 1 source: Game Spark.
Why it matters
Sega first passed on ARARA's assurance that nothing had leaked on October 29 and only confirmed the leak on November 3, after ARARA disclosed the breach itself on November 1, which is the timeline that matters for anyone whose address sat in those eleven send lists.
Key Facts
- Sega reported that 2,196,044 email addresses leaked after unauthorized access to ARARA Message, operated by ARARA.
- Of the leaked records, 92,273 also included information accompanying distribution, which Sega has not detailed.
- Sega said names, birth dates, addresses, phone numbers, credit card information and passwords were not leaked.
- Distribution through ARARA Message is suspended until safety is confirmed.
The affected mailings are 11 sends between July and October 2026, including CHUNITHM Mate, Ongeki Re:Fresh Act.2 and maimai DX MAGiCAL operation notices. Names, birth dates, addresses, phone numbers, card data and passwords were not leaked, and SEGA Account addresses are unaffected.
Sega traced the exposure to the distribution lists of newsletters sent through ARARA Message, the service operated by ARARA. The eleven affected sends ran from July 2 to October 28, 2026, and cover Sega Lucky Kuji notices, Tokyo Game Show 2026 exhibit mailings, and operation announcements for CHUNITHM Mate, Ongeki Re:Fresh Act.2 and maimai DX MAGiCAL.
Sega has not disclosed what the information accompanying distribution on 92,273 records contains, saying it is still investigating with ARARA. Newsletter distribution through ARARA Message is suspended until safety is confirmed, and the two companies plan to report the matter jointly to the Personal Information Protection Commission.
- July 2: Notice of the start of operation of CHUNITHM Mate
- July 6: Sega Lucky Kuji Online release information
- July 13: Sega Lucky Kuji Online release information
- July 23: Notice of the start of operation of Ongeki Re:Fresh Act.2
- September 4: Sega Lucky Kuji release information
- September 7: Sega Lucky Kuji Online release information
- September 17: Tokyo Game Show 2026 exhibit information
- September 17: Notice of the start of operation of maimai DX MAGiCAL
- September 18: Tokyo Game Show 2026 exhibit information
- October 21: Sega Lucky Kuji Online release information
- October 28: Sega Lucky Kuji Online release information
Written with AI by Yomimono from the 1 cited source below, including Japanese-language reporting where cited. See our editorial policy.
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