Georgi Guninski reports that forwarding mail in-line while using the default
message. Forwarding mail in-line is not the default setting but it is easily
accessed through the "Forward As" menu item.
used to install malware or send spam.
is also executed when you reply to a mail, though limited to the sandbox of
the message. This script could spy on or alter the message you are
Switch to "plain text" mail composition, this vulnerability only affects
HTML mail composition (the default). On the "Composition and Addressing" tab
of Thunderbird's Account Settings dialog uncheck the "Compose messages in
HTML format" option to compose messages in plain text.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.