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Mozilla Foundation Security Advisory 2013-94

Title: Spoofing addressbar though SELECT element
Impact: Moderate
Announced: October 29, 2013
Reporter: Jordi Chancel
Products: Firefox, Thunderbird, Seamonkey

Fixed in: Firefox 25.0
  Firefox ESR 24.1
  Thunderbird 24.1
  Seamonkey 2.22


Security researcher Jordi Chancel discovered a method to put arbitrary HTML content within <select> elements and place it in arbitrary locations. This can be used to spoof the displayed addressbar, leading to clickjacking and other spoofing attacks.

In general this flaw cannot be exploited through email in the Thunderbird and Seamonkey products because scripting is disabled, but is potentially a risk in browser or browser-like contexts.