Csdn.net

CSDN which is the largest developer community in China suffered a massive data breach involving over 6 million user accounts. The incident revealed that the service was storing user passwords in plain text format without any encryption or hashing. The data was widely circulated on various underground forums and file sharing services after the initial compromise. This leak remains one of the most significant security failures in the history of Chinese internet services because it exposed the credentials of millions of IT professionals and developers.