Old Firefox and IE still vulnerable for attacks

Mozilla's Firefox and Microsoft's Internet Explorer Web browsers fail to securely handle keystrokes entered by the user, potentially allowing an attacker the ability to download files.

The issue appears affects versions 1.5 and 2.0 of Mozilla's Firefox browser and versions 5.0, 5.5, 6 and 7 of Microsoft's Internet Explorer.

The design problem could also affect the Opera browser, according to GNUCitizen.org.