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From The CircuitryVerified tech news, cross-checked.How we verify →
  • Capcom confirms CAPCOM ID breach exposing 11.77 million email recordsSecurity
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Home/Security/Sony Unit So-net Says Breach Leaked Up to About 2.6M Member Records
VERIFIEDBy Xavier Rivera·Wednesday, October 28, 2026 at 4:23 PM AST·3 min read

Sony Unit So-net Says Breach Leaked Up to About 2.6M Member Records

Sony Network Communications, the wholly owned Sony Group company behind the So-net internet service provider, says a third party accessed its So-net member database on Oct 19 and that up to about 2.6 million member records leaked, including 443,495 from plala (S Course) and 16 bank-account records. No credit card data leaked, Sony says.

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Sony Unit So-net Says Breach Leaked Up to About 2.6M Member Records
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TL;DRAI · 60 sec read

Sony Network Communications says a third party accessed its So-net member database on Oct 19, leaking up to about 2.6 million member records (2,585,481): 2,141,986 So-net and 443,495 plala (S Course), an internet service option for NTT Docomo's Docomo Hikari. Sony says 16 bank-account records were exposed and no credit card data leaked. Email passwords for 54,401 addresses were reset. A separate Docomo phishing warning about fake d POINT Club emails is not linked to the breach.

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⚐ CORRECTEDThursday, October 29, 2026 at 12:35 PM EDT

Corrected figures and wording: an earlier version said 2.5 million customer records were affected and that no other payment details were exposed. Sony says up to about 2.6 million member records leaked, including 16 bank-account records. We also separated Docomo's breach notice from an unrelated Docomo warning about fake d POINT Club emails.

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Correction, Oct. 29, 2026: An earlier version of this article said 2.5 million customer records were affected and that no other payment details were exposed. Sony says up to about 2.6 million member records leaked, and that 16 records with bank-account details were among the data exposed. We also separated two unrelated NTT Docomo notices: its notice about the So-net breach, and a separate warning about fake d POINT Club emails.

Sony Network Communications, a wholly owned Sony Group subsidiary, said on Oct 27 that its So-net member database was accessed without authorization. So-net is the company's internet connection service, which makes it an internet service provider (ISP) in Japan. Sony says up to about 2.6 million member records leaked, 2,585,481 in total: 2,141,986 So-net records and 443,495 plala (S Course) records. Sony counts records, not people, and does not say how many individuals are affected. Per Sony's notice, they cover current members and people who left in March 2026 or later; members who left by the end of February 2026 were not affected.
Sony says no credit card data was leaked, but 16 records containing bank-account details were.
Timeline (Japan time). Sony says the unauthorized access happened on Oct 19 and that it confirmed it on Oct 23, then promptly stopped the affected servers and blocked traffic from the source. On Oct 24 it established that personal information had leaked and how much. It disclosed the incident on Oct 27 and has reported it to Japan's Personal Information Protection Commission. Sony gives the cause as unauthorized access by a third party, which is still under investigation. It has not said who was behind the attack or how they got in.

What leaked. The member records include names, phone numbers, email addresses, user IDs, dates of birth, gender and internet-connection IDs. Sony says passwords were not part of those records and that no credit card data leaked. It also confirmed that 16 bank-account records were exposed (bank, branch, account type, account number and holder name; Sony says it holds no account PINs), along with seven password-reset notice records.
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Email passwords. Sony says the leaked records include email-account passwords tied to 54,401 email addresses on four mail services: Mail Service G, A-Box, So-net VAIO Mail and PostPet mail. They are a subset of the overall total, not in addition to it. Sony reset those passwords on Oct 27, and affected users must set new ones through So-net My Page. Sony says it has found no secondary harm so far.

Docomo's role. According to NTT Docomo's notice, Docomo entrusts the So-net member database to Sony Network Communications for plala (S Course), an internet service option for NTT Docomo's Docomo Hikari fiber. Docomo says the 443,495 plala records cover current plala (S Course) users and people who canceled within the past six months, and that it will notify affected customers individually. Docomo says its other Hikari and plala services were not affected. Docomo's breach notice says the plala (S Course) data it describes does not include passwords, credit card or bank-account information; Sony says the 16 bank-account records were So-net records.

A separate Docomo warning. Also on Oct 27, Docomo issued a separate notice warning of fake emails posing as its d POINT Club and offering Universal Studios Japan (USJ) campaign tickets. That notice does not mention So-net or the breach, and Docomo has not linked the two.
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The incident was first reported in English by BleepingComputer. This story relies on Sony's and Docomo's own notices for the figures above.
Why this mattersAI · ~100 words

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