NTT Communications, a Japanese telecoms service provider, has experienced a significant data breach with unauthorized access detected on February 5th and again on February 15th. The breach has potentially compromised data related to nearly 18,000 corporate customers' mobile phone contracts, including customer names, contacts, phone numbers, email addresses, and information about service usage. This data leak poses a risk to the confidentiality of customer information and could have severe repercussions for those affected.

NTT Communications Corporation reported a cybersecurity incident affecting approximately 18,000 corporate customers. Hackers compromised the 'Order Information Distribution System,' resulting in the potential theft of customer names, contact details, and service usage information. Despite the security breach discovery on February 5 and the containment of threats, further investigation revealed an attacker's pivot to another network device on February 15, which was also disconnected. NTT's incident response did not include personalized notifications; instead, a public website announcement was made. The breach did not affect contracts for smartphones and mobile phones provided by NTT Docomo.