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Mozilla Foundation Security Advisory 2005-26

Title: Cross-site scripting by dropping javascript: link on tab
Severity: Critical
Risk: Low
Reporter: Michael Krax
Products: Firefox, Mozilla Suite

Fixed in: Firefox 1.0.1
  Mozilla Suite 1.7.6


Dropping a javascript: or data: link on a tab executes in the context of the site already loaded in the tab. If an attacker could convince a user to drag and drop such a link on a particular tab this could be used to steal information or credentials associated with the site in that tab.

If the target tab contained privileged content, such as about:config, the dropped javascript link could run arbitrary code on the user's machine.


Don't drag and drop opaque links. Disable Javascript.