zhihuishu.com

On March 31, 2021, a massive data leak exposed the personal information of over 2 million users from the Chinese online education platform 智慧树 (Zhihuishu). The leaked data included sensitive information such as names, email addresses, phone numbers, and passwords.

The leak was discovered by cyber security researchers at the University of Toronto, who identified a vulnerability in the 智慧树 platform that allowed attackers to access user data. The researchers notified 智慧树 of the breach, and the company quickly took steps to patch the vulnerability and secure user data.