Sega says 2,196,044 email addresses leaked in ARARA breach
Sega and Sega Fave newsletter addresses were exposed through contractor ARARA's ARARA Message system; SEGA Account data was unaffected.
Sega said on November 9, 2026 that a third party gained unauthorized access to the ARARA Message system operated by its contractor ARARA, which Sega and Sega Fave used to send some of their email newsletters. According to game.watch.impress.co.jp, 2,196,044 email addresses had leaked as of that date.
For 92,273 of those addresses, information accompanying the newsletter distribution also leaked. Sega said user names, birthdates, gender, addresses, phone numbers, credit card information and login passwords were not exposed.
The company added that email addresses registered with SEGA Account are handled by a different distribution system and were not part of the leak.
ARARA is investigating the cause of the unauthorized access and working to limit further damage, Sega said.
Sega warned that emails impersonating Sega or Sega Fave, or using the names of their products and services, may be sent to affected addresses. The company said no misuse of the leaked information has been confirmed so far.
Affected newsletters
The newsletters involved were sent between July 2 and October 28, 2026 and covered CHUNITHM Mate, Sega Lucky Kuji online sales, Ongeki Re:Fresh Act.2, Tokyo Game Show 2026 exhibits and launch notices for maimai de luxe MAGiCAL.
Quick answers
How many email addresses leaked in the Sega ARARA breach?
Sega reported 2,196,044 leaked email addresses as of November 9, 2026, with additional information exposed for 92,273 of them.
Were SEGA Account passwords or credit card data leaked?
Sega said names, birthdates, gender, addresses, phone numbers, credit card information and login passwords did not leak, and that SEGA Account uses a separate distribution system.
Which Sega newsletters were affected?
Newsletters sent between July 2 and October 28, 2026 covered CHUNITHM Mate, Sega Lucky Kuji online sales, Ongeki Re:Fresh Act.2, Tokyo Game Show 2026 exhibits and maimai de luxe MAGiCAL launch notices.