We use cookies to provide you with a better experience. If you continue to use this site, we'll assume you're happy with this. Alternatively, click here to find out how to manage these cookies

hide cookie message
80,259 News Articles

Mozilla patches Firefox security bug

Javascript vulnerability fixed

Mozilla has released an update to its Firefox browser, fixing a known security flaw in the open-source software.

The bug, reported last week, relates to the way Firefox handles JavaScript code. It could be exploited by attackers to crash an unpatched browser, and, in theory, could provide them with a way to trick the browser into running malicious code, Mozilla said in a security alert.

The problem has to do with an error caused when Firefox handles certain unexpected "contentWindow.focus()" JavaScript code. It can be circumvented by disabling Firefox's JavaScript handling capability.

Users of the older Firefox 1.0 browsers and the Mozilla Suite 1.7 are not affected by the flaw, and Firefox 1.5 users should soon start to receive software patches under the browser's automatic update system.

Mozilla developers said last week that they had reduced the number of features in the 1.5.0.3 update to speed up the release of this security fix.

Release notes for the 1.5.0.3 browser can be found alert.


IDG UK Sites

Windows 10 launch event as it happened: Read our Windows 10 launch live blog - find out first as...

IDG UK Sites

Windows 9 and the death of the OS as a must-have product

IDG UK Sites

Video trends: 4K is here – HDR video, VR and 3D audio is coming

IDG UK Sites

Best iPhone 6, iPhone 6 Plus deals: iPhone 6, iPhone 6 Plus tariffs, contracts and prices UK