Yahoo acknowledged the theft of more than 400,000 plaintext passwords that were subsequently posted on the Internet. While most of the passwords seem to have been taken from the Yahoo voice services, various industry sources are recommending that everyone with a Yahoo account immediately change their passwords. A group called the D33DS Company has been attributed as the source of the breach. The hackers are believed to have used a Union-based SQL injection to collect the data, and the group claims they posted the passwords as a high-profile way of making a point about Yahoo’s security and the state of information security, in general. Best advice: Change your password!