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Mozilla Foundation Security Advisory 2012-103

Title: Frames can shadow top.location
Impact: High
Announced: November 20, 2012
Reporter: Mariusz Mlynski
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 17.0
  Firefox ESR 10.0.11
  Thunderbird 17.0
  Thunderbird ESR 10.0.11
  SeaMonkey 2.14


Security researcher Mariusz Mlynski reported that the location property can be accessed by binary plugins through top.location with a frame whose name attribute's value is set to "top". This can allow for possible cross-site scripting (XSS) attacks through plugins.

In general these flaws cannot be exploited through email in the Thunderbird and SeaMonkey products because scripting is disabled, but are potentially a risk in browser or browser-like contexts in those products.