NetEase, the Chinese internet company behind the widely used 163.com and 126.com email services, was reported in 2015 to have suffered a breach affecting approximately 235 million user accounts. The compromised dataset later surfaced on dark web marketplaces, where it was offered for sale by cybercriminals. NetEase publicly denied any breach of its systems, attributing leaked credential samples to phishing activity rather than a direct compromise. The incident remains partially disputed. Cybersecurity researchers and the breach notification service Have I Been Pwned (HIBP) catalogued the dataset as unverified but legitimate, based on multiple users confirming their own credentials within the leaked data. The exposed data consisted of email addresses and plaintext passwords. Plaintext storage means passwords were recorded in readable form rather than being scrambled through cryptographic hashing, a standard security practice. If confirmed, this would represent a fundamental failure in how user credentials were protected. For affected individuals, the practical consequence is that anyone who obtained the dataset could attempt to log in to their NetEase account directly, and could try the same email and password combination across banking, social media, and other platforms where the user may have reused credentials. No formal breach notification was issued to affected users, and no regulatory action or legal proceedings arising from this incident have been publicly confirmed. NetEase's denial means affected individuals received no official warning. People who used 163.com or 126.com email services around this period and reused those passwords elsewhere should treat those credentials as compromised, change them immediately on any accounts where they were reused, and enable two-factor authentication where available.

Large internet platforms collect user identity, gaming data, email accounts, behavioral activity, and digital service usage across multi-product ecosystems.

NetEase has continued expanding its gaming, education, and music businesses. Its cloud music platform NetEase Cloud Music went public on the Hong Kong Stock Exchange in 2021. The company has navigated China's broader regulatory environment for internet companies, which has included licensing scrutiny and content oversight. NetEase's game development operations remain a core revenue driver with titles distributed in international markets.