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Mozilla Foundation Security Advisory 2013-23

Title: Wrapped WebIDL objects can be wrapped again
Impact: Critical
Announced: February 19, 2013
Reporter: Boris Zbarsky
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 19.0
  SeaMonkey 2.16


Mozilla developer Boris Zbarsky reported that in some circumstances a wrapped WebIDL object can be wrapped multiple times, overwriting the existing wrapped state. This could lead to an exploitable condition in rare cases.