JP — ITmedia
Nifty May Have Leaked Over 540,000 Records in Unauthorized Access to Optical Line Application System
Security1 min read
Nifty, a Japanese internet provider, says that up to 542,513 customer records may have leaked after hackers got into a system used for optical fiber internet sign-ups.
What happened
On October 19, 2026, Nifty found that someone had broken into its internal system for handling line applications and reception management. The company says personal data may have leaked. The attack hit an internal system, not the sign-up forms on Nifty's website. The attacker's connection has already been blocked.
Key facts
- Up to 542,513 records may have leaked.
- The data may cover people who applied for optical fiber services from outside Nifty's website since 2019.
- Possible leaked items: member ID, name, gender, birth date, address, phone number, and email address.
- Bank account and credit card information are not included, the company says.
- The break-in was found at about 10:20 a.m. on October 19.
Some terms explained
Optical fiber internet uses thin glass cables to send data very fast. A “sign-up system” is the computer system that stores and processes customer applications. “Unauthorized access” means someone entered a computer system without permission.
Why it matters
Personal details like names, addresses, and phone numbers can be misused for scams or fake messages. Customers who signed up for these services in the past may need to watch for suspicious contact. Bank and credit card details were not included, which lowers one major risk.
What to watch
- Results of Nifty's detailed investigation.
- Reports to the Personal Information Protection Commission, Japan's privacy watchdog.
- Any new facts that show the leak is larger or different.
- Official notices from Nifty about what affected customers should do.