---
title: NTT Solmare Comic Seima: member PII leaked after unauthorized access; service halted Oct 15 | ctxsec
url: https://ctxsec.com/items/ntt-solmare-comic-seima-2026-10
description: ""
status: "confirmed (vendor)"
published: 2026-10-16
---

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[← Cybersecurity News](/news) · [markdown](/items/ntt-solmare-comic-seima-2026-10.md)

confirmed (vendor)

2026-10-16

### NTT Solmare Comic Seima: member PII leaked after unauthorized access; service halted Oct 15

NTT Solmare Co., Ltd. confirmed on Oct 16 that a third party accessed systems managing Comic Seima (コミックシーモア) member data and that some registered member information leaked. Timeline: Oct 15 ~11:35 JST the company judged unauthorized access likely, stopped the service, and blocked the access; Oct 16 investigation confirmed leakage from the member-info system. Exposed so far: email, hashed password, DOB, gender, nickname. Count still under review. Company says credit cards are not held in the affected system; purchase history and MY Bookshelf leakage/loss/corruption not confirmed. Users who reuse the same email+password elsewhere should rotate those credentials and watch for phishing impersonating Comic Seima.

Sources: [NTT Solmare press release (Oct 16)](https://www.nttsolmare.com/press/2026/1016.html)