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Mozilla Foundation Security Advisory 2012-99

Title: XrayWrappers exposes chrome-only properties when not in chrome compartment
Impact: High
Announced: November 20, 2012
Reporter: Peter Van der Beken
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 17.0
  Thunderbird 17.0
  SeaMonkey 2.14


Mozilla developer Peter Van der Beken discovered that same-origin XrayWrappers expose chrome-only properties even when not in a chrome compartment. This can allow web content to get properties of DOM objects that are intended to be chrome-only.

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.