Serious vulnerabilities discovered in Mozilla Firefox Browser

12 May 2005

While Microsoft's security bulletins for May report no critical vulnerabilities, two severe vulnerabilities have been discovered in version 1.0.3 of the Mozilla Firefox browser. Firefox has been growing fast in popularity since its official release in November of last year and now makes up around 16% of all visits to These vulnerabilities involve the handling of Javascript and could allow an attacker to execute arbitrary code on affected computers.

To fix this problem Firefox users need to download and install version 1.0.4 of Mozilla Firefox.

More Information

Mozilla Firefox:

Microsoft Windows:

We recommend that users patch their systems by downloading and installing critical Windows updates and Office updates from Microsoft as soon as possible.

Users are also encouraged to update their antivirus software daily and to install a firewall on their computers, if they do not have one already. For more information on firewalls, please read Microsoft's tutorial on how to protect your PC.

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