Red Hat Security Advisory 2011-1439-01 - Mozilla Thunderbird is a standalone mail and newsgroup client. A flaw was found in the way Thunderbird handled certain add-ons. Malicious, remote content could cause an add-on to elevate its privileges, which could lead to arbitrary code execution with the privileges of the user running Thunderbird. A cross-site scripting flaw was found in the way Thunderbird handled certain multibyte character sets. Malicious, remote content could cause Thunderbird to run JavaScript code with the permissions of different remote content.
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