A significant data breach at Knownsec, a Chinese cybersecurity firm, leaked over 12,000 classified documents detailing advanced state-sponsored cyber tools and a list of global surveillance targets. The breach, which occurred in November 2025, revealed extensive cyber espionage activities and sophisticated attack methods.

A massive leak has revealed sensitive data from China's Great Firewall, exposing the scale and intricacies of the country's internet censorship system. The leak includes information about methods used to block foreign websites and monitor citizens' online activities, raising concerns about privacy and state control in China.

Over 4 billion user records, including sensitive financial, WeChat, and Alipay data, were exposed in what is believed to be the largest data leak in China’s history. The dataset, comprising 631 gigabytes, was left unprotected and is thought to have been collected for surveillance and profiling purposes. Affected individuals face significant risks with no clear recourse due to the anonymity of the data's source.