An add-on for the popular Firefox browser hid potentially malicious code, possibly contaminating the machines of anyone who downloaded it.

Security researchers at the Shadowserver Foundation have discovered another round of SQL injection attacks, this one affecting more than 4,000 web pages that are based on Microsoft's ASP and .NET technologies.

In a civil action, the Federal Trade Commission slammed the door shut on spammers that spewed unsolicited emails numbering in the millions.

Researchers at McAfee said they have detected the largest outbreak of malware in three years, an infection impacting hundreds of thousands of users whose machines contain poisoned media files.

Security companies should pay close attention to how an appeals court rules in the case of accused adware maker Zango versus anti-virus firm Kaspersky Lab.

Users of Yahoo's search engine can now traverse the internet with some body armor thanks to a partnership with McAfee that was announced Tuesday.

Security researchers recently found a server being used to harvest private information consisting of stolen data from 40 international businesses, as well as health-related information on patients worldwide.

The Mozilla Foundation's Mozilla Messaging subsidiary has released patches for five flaws in its Thunderbird e-mail client.

Online retail success invariably begets fraud, and in the case of many online merchants this fraud takes the form of chargebacks.

Credit card thieves are taking advantage of the vulnerabilities in small retailers' point-of-sale check-out systems, according to a new report.