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Mozilla Foundation Security Advisory 2005-12

Title: javascript: Livefeed bookmarks can steal cookies
Severity: High
Reporter: Omar Khan
Products: Firefox

Fixed in: Firefox 1.0


Earlier versions of Firefox allowed javascript: and data: URLs as Livefeed bookmarks. When they updated the URL would be run in the context of the current page and could be used to steal cookies or data displayed on the page.

If the user were on a page with elevated privileges (for example, about:config) when the Livefeed was updated, the feed URL could potentially run arbitrary code on the user's machine.


Do not add non-http URLs as a Livefeed bookmark. Upgrade to the fixed version