Google has fixed a problem that prevented a significant number of users from logging into their Calendar accounts.

Apple's Safari browser contains a critical, unpatched bug that attackers can use to infect Windows PCs with malicious code, researchers at US-CERT and other security firms said today.

Another day, another Facebook security snafu. The popular social network has patched a major security bug that allowed users to snoop on their friends' private chats, and view their pending friend requests.

After distributing a buggy antivirus update that apparently disabled hundreds of thousands of computers on Wednesday, McAfee is still at a loss to explain exactly what happened.

One week after a critical bug was made public, Oracle has patched its Java virtual machine to fix an exploit that could be used to sneak malicious software onto a computer.

Adobe Systems is working to fix a glitch in software it uses to speed up downloads of its products that could give hackers a way to push malicious programs onto a victim's PC.

Problems once again wracked Oracle's new My Oracle Support portal this week, with some users reporting difficulties accessing the site.

Microsoft has fixed a problem in Office 2003 that prevented the software from opening documents saved using its access control technology.