Tianya.cn, China's biggest online forum confirmed on Sunday that private information for 40 million users had been leaked, three days after the country's largest programmers' website CSDN reported a similar leak.
Usernames and passwords, all in clear text, were stolen by the hackers, Global Times reports.
“The released information belongs to users who registered on our website before November 2009, when we saved information in clear text format. After that we started using encryption,” a tianya.cn customer service staff member said.

Tianya.cn currently has about 60 million registered users in total.
Tianya.cn has launched an emergency response and informed users via email and forum messaging service to change their passwords as soon as possible. The online forum has also reported the case to the police.
Tianya is one of the most popular sites in China; it's the nexus of China's online communications, a collection of simple forums, blogs, and groups; due to uber-popularity Tianya is the best place in China's web to find public opinion on social issues, cultural experience, and original fresh content from millions of Chinese users. Based on netizen comments, the Tianya community meets the need for personal interaction, creation and expression. In a family oriented society, Tianya is China's dinner table, where news of the day is discussed in an open, personal fashion.
In related news, Sina Weibo, a Chinese microblogging service, denied allegations which claim that close to 5 million of their customers’ credentials and personal information were leaked, stating that all their user data is stored in an encrypted form.
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